Biodiversity Data Journal :
Species Conservation Profiles
|
Corresponding author: Pedro Cardoso (pedro.cardoso@helsinki.fi)
Academic editor: Pavel Stoev
Received: 05 Sep 2017 | Accepted: 11 Oct 2017 | Published: 18 Oct 2017
© 2017 Pedro Cardoso, Luís Crespo, Isamberto Silva, Paulo Borges, Mário Boieiro
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation:
Cardoso P, Crespo L, Silva I, Borges P, Boieiro M (2017) Species conservation profiles of endemic spiders (Araneae) from Madeira and Selvagens archipelagos, Portugal. Biodiversity Data Journal 5: e20810. https://doi.org/10.3897/BDJ.5.e20810
|
The North Atlantic archipelagos of Madeira and Selvagens present a unique biological diversity including, presently, 56 endemic spider species. Several recent projects provide valuable information on their distribution across most islands and habitats. To date, the only endemic spider assessed according to the IUCN Red List criteria is Hogna ingens. The objective of this paper is to assess all remaining endemic species and advise on possible future conservation actions critical for the survival of endangered species.
Seven species were found to have a continuing decline in either range or population size. Their decline can be mostly attributed to habitat destruction or degradation, invasive plant species that reduce quality of habitat, forest fires at high mountain regions and possible competition for resources from invasive congeners. The tetragnathid M. barreti is considered as possibly extinct due to the suspected impact of a competing species. Although most endemic spiders from the Madeira and Selvagens archipelagos have relatively low extinction risk due to the good condition and protection of the laurisilva forests where many live, there are a number of species requiring urgent attention and protection measures. These include all cave and mountain-restricted species as well as those threatened by competing congeners or invasive plants. Extending current protected areas, restoring original habitats of threatened species and the control of invasive taxa should remain a priority for species survival.
Arachnida, Arthropoda, extinction risk, islands, IUCN, Red List
The archipelagos of Madeira and Selvagens are renown for presenting a unique biological diversity, which is a major contributing factor (together with threat levels) for their inclusion in one of the major biodiversity hotspots worldwide, jointly with two other Macaronesian archipelagos (Azores and the Canaries) (
The most emblematic ecosystem of the archipelago – the laurisilva forest – is restricted to Madeira Island where it covers nearly 20% of the land surface (
Recent efforts were made to update the knowledge on the taxonomy and conservation priorities for the archipelagos of Madeira and Selvagens (
Despite the known vulnerability of many endemic spider species, only the Desertas wolf spider - Hogna ingens (Blackwall, 1857), Fig.
The objective of this paper is to assess the remaining 55 endemic spider species according to the IUCN criteria and advise on possible future conservation actions critical for the survival of endangered species. In the future we intend to assess a number of species currently being described in order to contribute to the proper protection of this unique fauna.
Species data were collected from all bibliography on Madeira and Selvagens spiders published until July 2017. These included mainly taxonomic and faunistic works. We also used numerous unpublished data collected within multiple projects (e.g.
For all analyses we used the R package red - IUCN redlisting tools (
In this work, the EOO and AOO were calculated in one of two ways:
- for extremely range restricted species for which we assumed to know the full range, these values were classified as observed, the minimum convex polygon encompassing all observations used to calculate the EOO and the 2x2 km cells known to be occupied used to calculate the AOO. When the EOO was smaller than the AOO, it was made equal as per the IUCN guidelines (
- for widespread species or those for which we did not have confidence to know the full range, we performed species distribution modeling (SDM). This was done based on two environmental datasets depending on the distribution of each species. For single island endemics of Madeira proper (main island) we used 100x100m resolution data on altimetry, slope, annual precipitation, annual maximum and minimum relative humidity, annual maximum and minimum temperature, land cover and a disturbance index based on the latter (
For SDMs we used ensemble modeling with the Maxent method (
weigthrun = max(0, (AUCrun - 0.5))2
Isolated patches outise the original distribution polygon were then excluded from maps to avoid overestimation of values. When performing SDMs, confidence limits for EOO and AOO were calculated using the number of models (runs) that predicted presence for each cell applying the percentiles 0.025 and 0.975 for the upper and lower limits respectively. All final maps and values were checked and validated by our own expert opinion. KMLs derived from these maps were also produced using the red package.
Kingdom | Phylum | Class | Order | Family |
---|---|---|---|---|
Animalia | Arthropoda | Arachnida | Araneae | Araneidae |
This species is not found since its description in 1859 (
Suppl. material
This species EOO and AOO are unkown.
Only reference for the Island of Madeira, from unspecified locality (
The population size and trend are unknown.
The habitat is unknown, the only specimen was captured in a garden at 200m altitude (
The ecology of the species is unknown. The species and family are orb weavers feeding mostly on flying insects.
Unknown threats.
The species has not been found since original description in 1859 (
Kingdom | Phylum | Class | Order | Family |
---|---|---|---|---|
Animalia | Arthropoda | Arachnida | Araneae | Lycosidae |
Suppl. material
This species EOO and AOO are unknown.
Recorded from both Madeira Island and Porto Santo, from unspecified localities (
The population size and trend are unknown.
There is poor information on species habitat, although the second record was from a sandy beach (
The species ecology is unknown. Species of the same family and genus are active epigean hunters of insects and other arthropods.
Unknown threats.
Adults of this species have not been found since the original description (
Aranha-cavernícola-de-São-Vicente
Kingdom | Phylum | Class | Order | Family |
---|---|---|---|---|
Animalia | Arthropoda | Arachnida | Araneae | Linyphiidae |
Possible junior synonym of Centromerus sexoculatus Wunderlich, 1992 (
Suppl. material
Known from two lava tube systems (
Only found in the lava tubes of Gruta dos Cardais in São Vicente, on northern Madeira Island, and Furnas do Cavalum in Machico, on eastern Madeira Island. Gruta dos Cardais is part of the largest known cave system in Madeira. The neighboring Grutas de São Vicente, which probably were once habitat for the species, are now in large part converted to show caves with extensive modifications in microclimate, including artificial lighting, water reservoirs and even newly built tunnels.
No decrease in EOO has been registered but it is inferred from decline in habitat quality.
No decrease in AOO was observed, but it is inferred from decline in habitat quality.
Two locations, Gruta dos Cardais and Furnas do Cavalum, are threatened by uncontrolled visits, accumulation of litter and, in the case of the first, being used as shelter for domestic animals (
The possible third location was lost more than 10 years ago, meaning the current trend in number of locations is probably stable despite the impeding threats.
The current threats are believed to cause a decrease in the species population numbers in unknown rates.
The uncontrolled visits by tourists and locals that think of caves as adventure playground, accumulation of litter and use by domestic animals cause major changes in the cave environment and consequent decrease in quality of habitat for the species. This is believed to be leading to a decrease in population numbers, although no monitoring is being made and the rates are unknown.
Only two subpopulations historically known.
Species known from two lava tube systems.
The quality of habitat is inferred to be decreasing due to severe changes in the environment of caves.
Ecology and traits are largely unknown as the only references to the species are from a short taxonomic description and a checklist. Yet, congeners are known to build sheet webs and this species might build them on cave walls on the hunt for insects.
The species was probably driven away from part of its historical range by touristic activities that include digging of new tunnels, water regime modifications (artificial pools) and artificial lighting. Both current locations are threatened by use of caves by domestic animals, uncontrolled visits and accumulation of litter.
Furnas do Cavalum are considered scientific patrimony by the "Plano Director Municipal" of Machico. Yet, this cave species would benefit from effective protection with adequate legislation of the two lava tube systems where it occurs with eventual restoration of natural conditions of the environment and recovery and re-introduction in the lost location. While this is not possible, or as an alternative, a strict code of conduct for touristic or other activities in caves should be enforced and both communication to the general public and training of touristic agents should be subject of a conservation plan.
The taxonomical status of the species and possible synonymy with C. sexoculatus should be clarified. Research on both the species current population trend and the reasons for this is needed to know the real threat levels and how to minimize them. A species conservation plan and a management plan would improve its survival chances for the future.
Aranha-cavernícola-do-Machico
Kingdom | Phylum | Class | Order | Family |
---|---|---|---|---|
Animalia | Arthropoda | Arachnida | Araneae | Linyphiidae |
Possible senior synonymy with Centromerus anoculus Wunderlich, 1995 (
Suppl. material
Only known from a single lava tube system (
Only found in the lava tubes of Furnas do Cavalum, close to Machico on eastern Madeira Island (
Possibly threatened by uncontrolled visits to the caves and accumulation of litter (
Possibly threatened by uncontrolled visits to the caves and accumulation of litter (
A single site is known for the species, which is currently under serious threat.
The single location is the full known historical range.
The population size of this species is unknown. It is possibly threatened by uncontrolled visits to the caves and accumulation of litter (
A single subpopulation exists of unknown size.
Species known from a single lava tube system, Furnas do Cavalum, Machico.
This is a troglobiont species with considerable eye reduction, depigmentation and appendage elongation. Ecology and traits are largely unknown as the only reference to the species is from a short taxonomic description. However, congeners are known to build sheet webs and this species might build them on cave walls on the hunt for insects.
This species is possibly threatened by uncontrolled visits to the caves and accumulation of litter (
Furnas do Cavalum are considered scientific patrimony by the "Plano Director Municipal" of Machico. Yet, this cave species would benefit from effective protection with adequate legislation of the lava tube system where it occurs with eventual restoration of natural conditions of the environment and recovery of its population. It should also be formally protected by adequate legislation.
The taxonomical status of the species and possible synonymy with C. anoculus should be clarified. Research on population trends and its causes is needed to know the real threat levels and how to minimize them. A species conservation plan and a management plan would improve its survival chances for the future.
Kingdom | Phylum | Class | Order | Family |
---|---|---|---|---|
Animalia | Arthropoda | Arachnida | Araneae | Linyphiidae |
Suppl. material
Multiple collection sites are recorded for this species, mostly recent and in laurisilva forest (
Centromerus variegatus is known throughout the laurisilva forest that occupies about 20% of the island, mainly on the steep and humid northern slopes.
The preferred habitat of the species, humid laurisilva forest, is not experiencing a decline in area and the invasive species present seem not to affect the spider populations.
The preferred habitat of the species, humid laurisilva forest, is not experiencing a decline in area and the invasive species present seem not to affect the spider populations.
No known threats to the species.
The preferred habitat of the species, humid laurisilva forest, is not experiencing a decline in area and the invasive species present seem not to affect the spider population.
No population size estimates exist.
Humid laurisilva forest on the northern slopes of Madeira Island.
This species is a sheet-web builder on the tree branches and under stones, feeding mainly on small insects. The species seems closely associated to the laurisilva forest.
Unknown threats.
Most of the species range lies inside the Madeira Natural Park.
Monitoring of population trends should be conducted to confirm species status.
Kingdom | Phylum | Class | Order | Family |
---|---|---|---|---|
Animalia | Arthropoda | Arachnida | Araneae | Linyphiidae |
Suppl. material
Multiple collection sites are recorded for the species, mostly recent and in laurisilva forest (
Ceratinopsis infuscata is known throughout the laurisilva forest that occupies about 20% of the island, mainly the steep and humid northern slopes.
The preferred habitat of the species, humid laurisilva forest, is not experiencing any decline in area and the invasive species present should not affect the spider population.
The preferred habitat of the species, humid laurisilva forest, is not experiencing any decline in area and the invasive species present should not affect the spider population.
No known threats to the species.
The preferred habitat of the species, humid laurisilva forest, is not experiencing any decline in area and the invasive species present should not affect the spider population.
No population size estimates exist.
Humid laurisilva forest on the northern slopes of Madeira Island.
The preferred habitat of the species, humid laurisilva forest, is not experiencing any decline in area and the invasive species present should not affect the spider population.
Sheet-web builder of the canopy stratum, feeding on small insects.
Unknown threats.
Most of the species range is inside the Madeira Natural Park.
Monitoring of population trends should be conducted to confirm species status.
Kingdom | Phylum | Class | Order | Family |
---|---|---|---|---|
Animalia | Arthropoda | Arachnida | Araneae | Theridiidae |
Suppl. material
Only four records for this species exist, mostly recent and all in laurisilva forest (
Dipoenata longitarsis is known from a few sites in laurisilva forest that occupies about 20% of the island, mainly on its steep and humid northern slopes.
The preferred habitat of the species, humid laurisilva forest, is not experiencing any decline in area and the invasive species present should not affect the spider population.
The preferred habitat of the species, humid laurisilva forest, is not experiencing any decline in area and the invasive species present should not affect the spider population.
No known threats to the species.
The preferred habitat of the species, humid laurisilva forest, is not experiencing any decline in area and the invasive species present should not affect the spider population.
No population size estimates exist.
Humid laurisilva forest on the northern slopes of Madeira Island.
The preferred habitat of the species, humid laurisilva forest, is not experiencing any decline in area and the invasive species present should not affect the spider population.
As other species in the genus, D. longitarsis may feed mostly on ants at ground level and low vegetation.
Unknown threats.
Most of the species range is inside the Madeira Natural Park.
Monitoring of population trends should be conducted to confirm species status.
Kingdom | Phylum | Class | Order | Family |
---|---|---|---|---|
Animalia | Arthropoda | Arachnida | Araneae | Gnaphosidae |
Suppl. material
Largely unknown, as there are only two records for the species (
Drassodes rugichelis is known from two sites (Paúl da Serra and Pico do Cidrão), both on open mountain areas. The true range is however unknown and not possible to model with confidence.
No population size estimates exist.
The two only known sites for the species are in open, mountain areas.
The ecology of this species is mostly unknown, but it is probable that they are active nocturnal hunters at ground level.
The mountain areas of Madeira Island have been affected by recent wildfires, which might have affected this species.
Part of the known species range is inside the Madeira Natural Park.
The distribution of the species should be researched through extensive collections on the islands' mountainous areas above the tree line. Monitoring of population trends should be conducted in the future and the negative effects of possible threats, such as wildfires, should also be assessed.
Aranha-tenaz-das-Selvagens
Kingdom | Phylum | Class | Order | Family |
---|---|---|---|---|
Animalia | Arthropoda | Arachnida | Araneae | Dysderidae |
Suppl. material
The restricted distribution of the species allows to known its EOO and AOO with reasonable confidence.
The species is restricted to the small Selvagens archipelago that lies between Madeira and the Canary Islands, where it possibly occupies all islets - Selvagem Grande, Selvagem Pequena and Ilhéu de Fora (
No current threats to the species.
No current threats to the species.
No current threats to the species.
No current threats to the species.
No current threats to the species.
No population size estimates exist.
No current threats to the species.
The Selvagens archipelago is dominated by barren areas with low herbaceous vegetation and rocky outcrops.
The natural vegetation of Selvagem Grande has been largely recovered by successful projects coordinated by the Madeira Natural Park devoted to the eradication of invasive species.
This species is found across the islands living on barren and rocky areas. The diet of D. aneris is unknown, although most congeners are specialized hunters feeding on woodlice.
Although not currently a threat, the invasive D. crocata has been previously found on Selvagem Grande in the past (
The entire range of the species is within the Selvagens Nature Reserve.
Monitoring of population trends should be conducted to confirm this species status. In addition, some information on the species life history, namely feeding regimen, should be collected as it might be restricted to very few prey types with implications for its conservation.
Aranha-tenaz-de-Coiffait
Kingdom | Phylum | Class | Order | Family |
---|---|---|---|---|
Animalia | Arthropoda | Arachnida | Araneae | Dysderidae |
Suppl. material
Multiple collection sites are recorded for the species, mostly recent and in laurisilva forest. It was possible to perform species distribution modeling to predict its potential range with confidence limits. See methods for details.
Dysdera coiffaiti is known throughout the laurisilva forest that occupies about 20% of the island, mainly on its steep and humid northern slopes.
The preferred habitat of the species, humid laurisilva forest, is not declining in area and the invasive species present should not affect this spider's population.
The preferred habitat of the species, humid laurisilva forest, is not experiencing any decline in area and the invasive species present should not affect this spider's population.
No known threats to the species.
No known threats to the species
No known threats to the species.
No population size estimates exist.
Humid laurisilva forest on the northern slopes of Madeira Island.
The preferred habitat of the species, humid laurisilva forest, is not declining in area and the invasive species present should not affect this spider's population.
Found across the laurisilva forest of Madeira Island, living on the soil. The diet of D. coiffaiti is unknown, although most congeners are specialized hunters feeding on woodlice.
Unknown threats.
Most of the species range is inside the Madeira Natural Park.
Monitoring of population trends should be conducted to confirm species status.
Aranha-tenaz-diversa
Kingdom | Phylum | Class | Order | Family |
---|---|---|---|---|
Animalia | Arthropoda | Arachnida | Araneae | Dysderidae |
Suppl. material
A single record is published on the original description without a precise locality (
Dysdera diversa is known only from high altitude areas of laurisilva forest (above 800m).
Inferred to be stable as the preferred habitat area and quality is stable.
Inferred to be stable as the preferred habitat area and quality is stable.
No known threats to the species.
Possibly stable as the preferred habitat area and quality is stable.
No species abundance estimates exist
High altitude laurisilva forest.
Preferred habitat area and quality is stable.
The species is found on few places of the high-altitude laurisilva forest of Madeira Island, living on the soil. The diet of D. diversa is unknown, although most congeners are specialized hunters feeding on woodlice.
Unknown threats.
All the species range is inside the Madeira Natural Park.
As few localities are known for the species, basic research on species distribution should be made. Monitoring of population trends should be conducted to confirm species status.
Aranha-tenaz-do-Porto-Santo
Kingdom | Phylum | Class | Order | Family |
---|---|---|---|---|
Animalia | Arthropoda | Arachnida | Araneae | Dysderidae |
Suppl. material
Only two subpopulations of this species are known. These are in close proximity, on the Island of Porto Santo, which has been extensively surveyed, therefore the entire current distribution of this species should be known.
The species seems to be restricted to the northeastern part of the island of Porto Santo. It was originally described from Pico Branco (
Although the species is not known to ever have occupied areas outside its current range, this is extremely small (EOO is in effect < 1km2) and restricted to two nearby peaks with very few remnant native vegetation, with most areas surrounding them being converted to agricultural fields now abandoned or exotic pine and cedar plantations.
The species is not known to ever have occupied areas outside its current range, this being extremely small (AOO is in effect < 1km2) and restricted to two peaks with very few remnant native vegetation. Most areas surrounding them were converted to agricultural fields now abandoned or exotic pine and cedar plantations.
The two peaks where the species is found are surrounded by exotic tree plantations with numerous invasive plant species. The species seems to be able to survive mostly among native vegetation but also in few sheltered sites with planted trees. Yet, the spread of invasive plants might jeopardize the subpopulations in these two peaks.
Further subpopulations were almost certainly lost in nearby peaks (e.g. Moledo or Pico da Gandaia), but probably before the species description in 1995.
Inferred from possible decline in habitat quality (leading also to possible decline in EOO and AOO) due to the effects of invasive plant species that do not provide adequate shelter for the spider.
No population size estimates exist.
As only one juvenile individual (identified through clear somatic characters) was found in Pico do Facho despite intensive sampling, it is possible that this subpopulation is endangered due to loss of habitat quality in the near future. That would mean that only a single subpopulation (50%) in Pico Branco would be left.
The species seems to be restricted to rocky or few native vegetation areas with Erica platycodon or Heberdenia excelsa often within exotic pine and cedar.
Possible estimated decline in habitat quality (leading also to possible inferred decline in EOO and AOO) due to the effects of invasive plant species that do not provide adequate shelter for the spider.
The species is found living within scarce patches of native vegetation. The diet of D. portisancti is unknown, although most congeners are specialized hunters feeding on woodlice.
As the species seems to be able to survive mostly among native vegetation, probably due to difficulty in finding adequate shelter within other plant species, the spread of invasive plants might jeopardize its survival.
Part of the original habitat (Pico Branco) is included in the Natura network, but both localities urgently need to be restored jointly with the neighbouring peaks. The spider would benefit from recovery and re-introduction to these new areas which should have been part of its historical range with possible ex-situ breeding for both re-introduction and raising awareness on its emperiled status.
Monitoring of population and habitat trends should be conducted to confirm species status. In addition, some information on life history, namely feeding regimen, should be collected about the species, as it might be restricted to very few prey types with implications for its conservation. The species would benefit from a species conservation plan that would include recovery actions for both the spider and the habitat and a management plan for new protected areas to be created within its historical range.
Aranha-tenaz-de-Vandel
Kingdom | Phylum | Class | Order | Family |
---|---|---|---|---|
Animalia | Arthropoda | Arachnida | Araneae | Dysderidae |
Suppl. material
Distribution of the species is unknown as there is only a single record from Caldeirão do Inferno in 1962 (
Distribution of the species is unknown as there is a single record from Caldeirao do Inferno in 1962 (
No population size estimates exist.
Probably humid laurisilva forest on the northern slopes of Madeira Island.
The diet of D. vandeli is unknown, although most congeners are specialized hunters feeding on woodlice.
Unknown threats.
The known species range is inside the Madeira Natural Park.
This species has not been found since the original description (
Kingdom | Phylum | Class | Order | Family |
---|---|---|---|---|
Animalia | Arthropoda | Arachnida | Araneae | Gnaphosidae |
Not recorded since original description from Madeira with uncertain locality (
Suppl. material
The species EOO and AOO are unknown.
Only mentioned from Madeira Island, with no locality data.
No population size estimates exist.
The species habitat is unknown.
If similar to other congeners, probably an active nocturnal hunter at ground level.
Unknown threats.
The species has not been found since original description in 1899 (
Kingdom | Phylum | Class | Order | Family |
---|---|---|---|---|
Animalia | Arthropoda | Arachnida | Araneae | Linyphiidae |
Suppl. material
Multiple collection sites are recorded for the species, mostly recent and in laurisilva forest (
Frontinellina dearmata is known throughout the laurisilva forest that occupies about 20% of the island, mainly on its steep and humid northern slopes.
The preferred habitat of the species, humid laurisilva forest, is not experiencing any decline in area and the invasive species present should not affect the spider population.
The preferred habitat of the species, humid laurisilva forest, is not experiencing any decline in area and the invasive species present should not affect the spider population.
No known threats to the species.
The preferred habitat of the species, humid laurisilva forest, is not experiencing any decline in area and the invasive species present should not affect the spider population.
No population size estimates exist.
Humid laurisilva forest on the northern slopes of Madeira Island.
Sheet-web builder at the canopy of native trees feeding mainly on small insects.
Unknown threats.
Most of the species range is inside the Madeira Natural Park.
Monitoring of population trends should be conducted to confirm species status.
Kingdom | Phylum | Class | Order | Family |
---|---|---|---|---|
Animalia | Arthropoda | Arachnida | Araneae | Linyphiidae |
Suppl. material
Multiple collection sites have been recorded for the species, mostly recent and in laurisilva forest (
Frontiphantes fulgurenotatus is known throughout the laurisilva forest that occupies about 20% of the island, mainly on its steep and humid northern slopes.
The preferred habitat of the species, humid laurisilva forest, is not experiencing any decline in area and the invasive species present should not affect the spider population.
The preferred habitat of the species, humid laurisilva forest, is not experiencing any decline in area and the invasive species present should not affect the spider population.
No known threats to the species.
The preferred habitat of the species, humid laurisilva forest, is not experiencing any decline in area and the invasive species present should not affect the spider population.
No population size estimates exist.
Humid laurisilva forest on the northern slopes of Madeira Island.
The preferred habitat of the species, humid laurisilva forest, is not experiencing any decline in area and the invasive species present should not affect the spider population.
Sheet-web builder on the tree branches feeding mainly on small insects.
Unknown threats.
Most of the species range is inside the Madeira Natural Park.
Monitoring of population trends should be conducted to confirm species status.
Kingdom | Phylum | Class | Order | Family |
---|---|---|---|---|
Animalia | Arthropoda | Arachnida | Araneae | Hahniidae |
Suppl. material
Multiple collection sites are recorded for the species, mostly recent and in laurisilva forest (
Hahnia insulana is known throughout the laurisilva forest that occupies about 20% of the island, mainly on its steep and humid northern slopes.
The preferred habitat of the species, humid laurisilva forest, is not experiencing any decline in area and the invasive species present should not affect the spider populations.
The preferred habitat of the species, humid laurisilva forest, is not experiencing any decline in area and the invasive species present should not affect the spider populations.
No known threats to the species.
The preferred habitat of the species, humid laurisilva forest, is not experiencing any decline in area and the invasive species present should not affect the spider populations.
No population size estimates exist.
Humid laurisilva forest on the northern slopes of Madeira Island.
The preferred habitat of the species, humid laurisilva forest, is not experiencing any decline in area and the invasive species present should not affect the spider populations.
This species is a sheet-web builder among the leaf-litter and low vegetation feeding mainly on small insects.
Unknown threats.
Most of the species range is inside the Madeira Natural Park.
Monitoring of population trends should be conducted to confirm species status.
Tarântula-de-Biscoito
Biscoito Wolf Spider
Kingdom | Phylum | Class | Order | Family |
---|---|---|---|---|
Animalia | Arthropoda | Arachnida | Araneae | Lycosidae |
Despite intensive searches during the last decade it was not possible to find this species recently described from undetermined locality in the island of Porto Santo (
Suppl. material
The species EOO and AOO are unknown.
Only recorded from the Island of Porto Santo, from undetermined locality.
No population size estimates exist.
The species habitat is unknown.
If valid, the species should be an active ground hunter feeding mainly on small/medium size arthropods.
Unknown threats.
Clarification of the taxonomic status is necessary. If valid, basic information would be needed on its distribution, ecology and possible threats.
Tarântula-de-Heer
Heer Wolf Spider
Kingdom | Phylum | Class | Order | Family |
---|---|---|---|---|
Animalia | Arthropoda | Arachnida | Araneae | Lycosidae |
Suppl. material
Multiple collection sites are recorded for the species, many of them recent and in a number of different habitats (
Hogna heeri is known from varied and contrasting habitats, from open barren areas in Bugio (Desertas) to laurisilva forest in Madeira Island.
The species seems to be able to live on all kinds of habitat, even close to human settlements.
The species seems to be able to live on all kinds of habitat, even close to human settlements.
No known threats to the species.
The species seems to be able to live on all kinds of habitat, even close to human settlements.
No population size estimates exist.
The species seems to be able to live on all kinds of habitat, from barren areas to laurisilva forest.
Active ground hunter feeding mainly on small/medium size arthropods.
Unknown threats.
Part of the species range is inside the Madeira Natural Park and in the Desertas Nature Reserve.
The disjunct distribution of the species is currently being researched and might lead to a change in the current estimated maps. Monitoring of population trends should be conducted to confirm species status.
Suppl. material
Multiple collection sites have been recorded for the species, mostly recent in all Madeiran islands at low altitude (
Hogna insularum is known in open habitats across all Madeiran islands at low altitudes. On Madeira Island it only occupies the eastern region.
The preferred habitat of the species, open grassland or shrubland with frequent rock outcrops, is not experiencing any decline in area and the invasive species present should not affect the spider populations.
The preferred habitat of the species, open grassland or scrubland with frequent rock outcrops, is not experiencing any decline in area and the invasive species present should not affect the spider populations.
No known threats to the species.
The preferred habitat of the species, open grassland or shrubland with frequent rock outcrops, is not experiencing any decline in area and the invasive species present should not affect the spider populations.
No population size estimates exist.
Open grassland or shrubland with frequent rock outcrops, very common in the eastern part of the archipelago at low altitudes.
The preferred habitat of the species is not experiencing any decline in area and the invasive species present should not affect the spider populations.
Active ground hunter feeding mainly on small/medium size arthropods.
Unknown threats.
Part of the species range is inside several protected areas including the Ponta de São Lourenco Special Protection Area and Desertas Nature Reserve.
Monitoring of population trends should be conducted to confirm species status.
Tarântula-da-Madeira
Madeira Wolf Spider
Kingdom | Phylum | Class | Order | Family |
---|---|---|---|---|
Animalia | Arthropoda | Arachnida | Araneae | Lycosidae |
Suppl. material
Multiple collection sites are recorded for the species, usually in open areas but at all altitudes, from coastal areas to the plateau of Paúl da Serra (
Hogna maderiana is known throughout the island of Madeira in open habitats.
The species seems to be able to live on several habitat types, even close to human settlements.
The species seems to be able to live on several habitat types, even close to human settlements.
No known threats to the species.
The species seems to be able to live on several habitat types, even close to human settlements.
No population size estimates exist.
The species seems to be able to live on several open habitat types, including coastal areas and high-altitude plateaus dominated by grasses.
Active ground hunter feeding mainly on small/medium size arthropods.
Unknown threats.
The disjunct distribution of the species is currently being researched and might lead to a change in the current estimated maps. Monitoring of population trends should be conducted to confirm species status.
Kingdom | Phylum | Class | Order | Family |
---|---|---|---|---|
Animalia | Arthropoda | Arachnida | Araneae | Lycosidae |
Suppl. material
The species EOO and AOO are unknown.
The true distribution of Hogna nonannulata is unknown (
No population size estimates exist.
The species was found from few sites in humid laurisilva forest (Ribeiro Frio) on the northern slopes of Madeira Island.
Active ground hunter feeding mainly on small/medium size arthropods.
Unknown threats.
The known locality is inside the Madeira Natural Park.
Basic information is needed on its distribution, ecology and possible threats.
Tarântula-de-Porto-Santo (Portuguese)
Porto Santo Wolf Spider (English)
Kingdom | Phylum | Class | Order | Family |
---|---|---|---|---|
Animalia | Arthropoda | Arachnida | Araneae | Lycosidae |
Suppl. material
Multiple collection sites are recorded for the species (
Across the entire island of Porto Santo and its small islets. Habitats include areas close to human settlements but exclude densely forested areas.
The species seems to be able to live on several habitat types, even close to human settlements.
The species seems to be able to live on several habitat types, even close to human settlements.
No current threats to the species.
The species seems to be able to live on several habitat types, even close to human settlements.
No population size estimates exist.
The species seems to be able to live on several habitat types, even close to human settlements. It only avoids densely forested areas.
Active ground hunter feeding mainly on medium/large size arthropods.
Unknown threats.
A small part of the species range is inside the Porto Santo Network of Marine Protected Areas (which include islets).
Monitoring of population trends should be conducted to confirm species status.
Kingdom | Phylum | Class | Order | Family |
---|---|---|---|---|
Animalia | Arthropoda | Arachnida | Araneae | Dictynidae |
Suppl. material
Multiple collection sites are recorded for the species, mostly recent and in all habitat types (
Lathys affinis is known on all islands across the Madeira archipelago and on all habitat types, from laurisilva forest to open arid areas.
The species seems to be able to live on several habitat types, even close to human settlements.
The species seems to be able to live on several habitat types, even close to human settlements.
No known threats to the species.
The species seems to be able to live on several habitat types, even close to human settlements.
No population size estimates exist.
The species seems to be able to live on several habitat types, even close to human settlements.
Small cribellate web builder on vegetation or ground level feeding mainly on small insects.
Unknown threats.
Much of the species range is inside the Madeira Natural Park and in several protected areas across the archipelago.
Monitoring of population trends should be conducted to confirm species status.
Kingdom | Phylum | Class | Order | Family |
---|---|---|---|---|
Animalia | Arthropoda | Arachnida | Araneae | Linyphiidae |
Suppl. material
Multiple collection sites are recorded for the species, mostly recent and in laurisilva forest (
Lepthyphantes impudicus is known throughout the laurisilva forest that occupies about 20% of the island, mainly on its steep and humid northern slopes.
The preferred habitat of the species, humid laurisilva forest, is not experiencing a decline in area and the invasive species present should not affect the spider populations.
The preferred habitat of the species, humid laurisilva forest, is not experiencing any decline in area and the invasive species present should not affect the spider populations.
No known threats to the species.
The preferred habitat of the species, humid laurisilva forest, is not experiencing any decline in area and the invasive species present should not affect the spider populations.
No population size estimates exist.
Humid laurisilva forest on the northern slopes of Madeira Island.
The preferred habitat of the species, humid laurisilva forest, is not experiencing any decline in area and the invasive species present should not affect the spider populations.
This species is a sheet-web builder on the tree branches feeding mainly on small insects.
Unknown threats.
Most of the species range is inside the Madeira Natural Park.
Monitoring of population trends should be conducted to confirm species status.
Kingdom | Phylum | Class | Order | Family |
---|---|---|---|---|
Animalia | Arthropoda | Arachnida | Araneae | Linyphiidae |
Suppl. material
Multiple collection sites are recorded for the species in laurisilva forest (
Lepthyphantes lundbladi is predicted to be present throughout the laurisilva forest that occupies about 20% of the island, mainly on its steep and humid northern slopes.
The preferred habitat of the species, humid laurisilva forest, is not experiencing any decline in area and the invasive species present should not affect the spider populations.
The preferred habitat of the species, humid laurisilva forest, is not experiencing any decline in area and the invasive species present should not affect the spider populations.
No known threats to the species.
The preferred habitat of the species, humid laurisilva forest, is not experiencing any decline in area and the invasive species present should not affect the spider populations.
No population size estimates exist.
Humid laurisilva forest on the northern slopes of Madeira Island.
This species is a sheet-web builder close to the soil, being first described from the entrance of a lava tube (Gruta da Ribeira do Inferno).
Unknown threats.
Most of the species range is inside the Madeira Natural Park.
Monitoring of population trends should be conducted to confirm species status.
Kingdom | Phylum | Class | Order | Family |
---|---|---|---|---|
Animalia | Arthropoda | Arachnida | Araneae | Linyphiidae |
Suppl. material
Multiple collection sites are recorded for the species, mostly recent and in laurisilva forest (
Lepthyphantes mauli is known from different sites in laurisilva forest that occupies about 20% of the island, mainly on its steep and humid northern slopes.
The preferred habitat of the species, humid laurisilva forest, is not experiencing any decline in area and the invasive species present should not affect the spider populations.
The preferred habitat of the species, humid laurisilva forest, is not experiencing any decline in area and the invasive species present should not affect the spider populations.
No known threats to the species.
The preferred habitat of the species, humid laurisilva forest, is not experiencing any decline in area and the invasive species present should not affect the spider populations.
No population size estimates exist.
Humid laurisilva forest on the northern slopes of Madeira Island.
The preferred habitat of the species, humid laurisilva forest, is not experiencing any decline in area and the invasive species present should not affect the spider populations.
This species is a sheet-web builder close to the soil, being first described from the entrance of a lava tube (Grutas de São Vicente).
Unknown threats.
Kingdom | Phylum | Class | Order | Family |
---|---|---|---|---|
Animalia | Arthropoda | Arachnida | Araneae | Salticidae |
Suppl. material
Multiple collection sites have been recorded for the species in both Porto Santo and Desertas (
Macaroeris desertensis is known throughout the islands and islets of Porto Santo and Desertas, mainly on open grassland, scrubland and rocky areas.
The species seems to be common in open areas of several islands and islets.
The species seems to be common in open areas of several islands and islets.
No known threats to the species.
The species seems to be common in open areas of several islands and islets.
No population size estimates exist.
Macaroeris desertensis is known throughout the islands and islets of Porto Santo and Desertas, mainly on open grassland, scrubland and rocky areas.
The species seems to be common in open areas of several islands and islets.
Active hunter on low vegetation feeding mainly on small/medium size arthropods.
Unknown threats.
Part of the species range lies inside the Desertas Nature Reserve and in the Porto Santo Network of Marine Protected Areas (which includes islets).
Monitoring of population trends should be conducted to confirm species status.
Kingdom | Phylum | Class | Order | Family |
---|---|---|---|---|
Animalia | Arthropoda | Arachnida | Araneae | Gnaphosidae |
Suppl. material
Multiple collection sites are recorded for the species, mostly recent and in laurisilva forest (
Macarophaeus cultior is known throughout the laurisilva forest that occupies about 20% of the island, mainly on its steep and humid northern slopes.
The preferred habitat of the species, humid laurisilva forest, is not experiencing any decline in area and the invasive species present should not affect the spider populations.
The preferred habitat of the species, humid laurisilva forest, is not experiencing any decline in area and the invasive species present should not affect the spider populations.
No known threats to the species.
The preferred habitat of the species, humid laurisilva forest, is not experiencing any decline in area and the invasive species present should not affect the spider populations.
No population size estimates exist.
Humid laurisilva forest on the northern slopes of Madeira Island.
The preferred habitat of the species, humid laurisilva forest, is not experiencing any decline in area and the invasive species present should not affect the spider populations.
Active nocturnal ground hunter feeding mainly on small/medium size arthropods.
Unknown threats.
Most of the species range is inside the Madeira Natural Park.
Monitoring of population trends should be conducted to confirm species status.
Kingdom | Phylum | Class | Order | Family |
---|---|---|---|---|
Animalia | Arthropoda | Arachnida | Araneae | Liocranidae |
Suppl. material
There are only three records for the species, mostly old (
Known from few sites at high altitude, in laurisilva forest or above tree-line.
One of the species habitats, humid laurisilva forest, is not experiencing any decline in area and the invasive species present should not affect the spider populations. The other habitat, mountain areas, experienced a severe wildfire in 2010 which might have reduced the species range.
One of the species habitats, humid laurisilva forest, is not experiencing any decline in area and the invasive species present should not affect the spider populations. The other habitat, mountain areas, experienced a severe wildfire in 2010 which might have reduced the species range.
A single wildfire event may affect the entire area above tree-line. The forest areas are in general not threatened.
One of the species habitats, humid laurisilva forest, is not experiencing any decline in area and the invasive species present should not affect the spider populations. The other habitat, mountain areas, experienced a severe wildfire in 2010 which might have reduced the species range.
No population size estimates exist.
One of the species habitats, humid laurisilva forest, is not experiencing any decline in area and the invasive species present should not affect the spider populations. The other habitat, mountain areas, experienced a severe wildfire in 2010 which might have reduced the species population.
The only records of the species are from both laurisilva (Queimadas) and the mountain peaks (Pico do Cidrão).
Although the laurisilva areas are extensive and mostly well-preserved, the mountain areas above the tree-line have suffered recent (2010) extensive wildfires that destroyed much of the native habitat. It is unknown whether these events have affected the species and to what proportion of its range, although this can be inferred.
Active ground hunter feeding mainly on small size arthropods.
Wildfires have negatively impacted the subpopulations above treeline in the past and may do it again in the future.
Most of the species range is predicted to be inside the Madeira Natural Park.
Given the high uncertainty the species range should be extensively studied. Furthermore, studies on the ecology of the species and how it was affected by wildfire is necessary. Afterwards, monitoring of population and habitat trends should be conducted to confirm species status.
Kingdom | Phylum | Class | Order | Family |
---|---|---|---|---|
Animalia | Arthropoda | Arachnida | Araneae | Tetragnathidae |
Suppl. material
Multiple collection sites are recorded for the species mostly in laurisilva forest, although none recently (
Meta barreti is (or was) known throughout the laurisilva forest that occupies about 20% of the island, mainly on its steep and humid northern slopes.
The preferred habitat of the species, humid laurisilva forest, is not experiencing any decline in area. It should be noted, however, that the species has not been recorded for at least two decades despite extensive sampling. At the same time, the endemic congener Meta stridulans is now commonly seen after description in 1987, about the same time as M. barreti was last recorded. It is possible there was replacement of one species by the other, both single island endemics, although this is for now only suspected.
The preferred habitat of the species, humid laurisilva forest, is not experiencing any decline in area. It should be noted, however, that the species has not been recorded for at least two decades despite extensive sampling. At the same time, the endemic congener M. stridulans is now commonly seen after description in 1987, about the same time as M. barreti was last recorded. It is possible there was replacement of one species by the other, both single island endemics, although this is for now only suspected.
The species is not recorded for at least two decades despite extensive sampling. At the same time, the endemic congener M. stridulans is now very common in the same habitat and region. If this latter species replaced M. barreti it was a fast single event, although this can only be suspected.
The preferred habitat of the species, humid laurisilva forest, is not experiencing any decline in area. It should be noted, however, that the species is not recorded for at least two decades despite extensive sampling. At the same time, the endemic congener M. stridulans is now commonly seen after description in 1987, about the same time as M. barreti was last recorded. It is possible there was replacement of one species by the other, both single island endemics, although this, for now, is only suspected.
No population size estimates exist.
The preferred habitat of the species, humid laurisilva forest, is not experiencing any decline in area. It should be noted however that the species is not recorded for at least two decades despite extensive sampling. At the same time, the endemic congener M. stridulans is now commonly seen after description in 1987, about the same time as M. barreti was last recorded. It is possible there was replacement of one species by the other, both single island endemics, although this, for now, is only suspected.
Humid laurisilva forest on the northern slopes of Madeira Island.
The preferred habitat of the species, humid laurisilva forest, is not experiencing any decline in area. It should be noted, however, that the species is not recorded for at least two decades despite extensive sampling. At the same time, the endemic congener M. stridulans is now commonly seen after description in 1987, about the same time as M. barreti was last recorded. It is possible there was replacement of one species by the other, both single island endemics, although this, for now, is only suspected.
This species is an orb-web builder, possibly on the tree branches, feeding mainly on small insects. The congener M. stridulans is much larger (up to 11 mm), possibly giving it a competitive advantage.
The endemic congener M. stridulans is now commonly seen after description in 1987, about the same time as M. barreti was last recorded. It is possible there was replacement of one species by the other, both single island endemics, although this is for now only suspected.
All the species range is inside the Madeira Natural Park. If its apparent disappearance from the native range is confirmed some measures targeting species recovery should be implemented.
The true distribution of the species and possible confusion with Meta stridulans should be clarified. Also research on the possible temporal replacement between these two species is needed.
Kingdom | Phylum | Class | Order | Family |
---|---|---|---|---|
Animalia | Arthropoda | Arachnida | Araneae | Tetragnathidae |
Suppl. material
Multiple collection sites are recorded for the species, mostly recent and in laurisilva forest (
Meta stridulans is known throughout the laurisilva forest that occupies about 20% of the island, mainly on its steep and humid northern slopes.
The preferred habitat of the species, humid laurisilva forest, is not experiencing any decline in area and the invasive species present should not affect the spider populations.
The preferred habitat of the species, humid laurisilva forest, is not experiencing any decline in area and the invasive species present should not affect the spider populations.
No known threats to the species.
The preferred habitat of the species, humid laurisilva forest, is not experiencing any decline in area and the invasive species present should not affect the spider populations.
No population size estimates exist.
Humid laurisilva forest on the northern slopes of Madeira Island.
This species is an orb-web builder, possibly on the tree branches, feeding mainly on small-medium size insects.
Unknown threats.
Most of the species range is inside the Madeira Natural Park.
Monitoring of population trends should be conducted to confirm species status.
Kingdom | Phylum | Class | Order | Family |
---|---|---|---|---|
Animalia | Arthropoda | Arachnida | Araneae | Thomisidae |
Suppl. material
The species EOO and AOO are unknown.
Misumena nigromaculata is known only from Funchal, south coast of Madeira Island, captured in October 1940 (
No population size estimates exist.
The only place of confirmed presence in Funchal was largely occupied by farms and gardens at the time. The unconfirmed identification in Ponta de São Lourenco is on a semi-arid grassland.
Unknown, but congeners are ambush hunters in low-vegetation, often seen waiting for prey on flowers.
The only confirmed locality and location is now mostly residential area in the outskirts of Funchal.
If a small range is confirmed in the future the species should benefit from a recovery plan. Yet, little information available precludes from advising on any concrete measures.
The true distribution of the species should be assessed along with possible threats along its range. If endangered, a species conservation plan encompassing recovery actions and area management should be needed to ensure the species survival.
Kingdom | Phylum | Class | Order | Family |
---|---|---|---|---|
Animalia | Arthropoda | Arachnida | Araneae | Oecobiidae |
Suppl. material
The species EOO and AOO are unknown.
Oecobius minor is known only from the mountainous area south of Faial on the northern coast of Madeira Island, captured in undefined date (
No population size estimates exist.
The only known locality probably is in laurisilva forest.
Unknown, but congeners build small flat webs over rocks or trunks where they hunt for small insects.
Unknown threats.
The known species range is inside the Madeira Natural Park.
The true distribution of the species should be assessed along with possible threats along its range.
Kingdom | Phylum | Class | Order | Family |
---|---|---|---|---|
Animalia | Arthropoda | Arachnida | Araneae | Oecobiidae |
Suppl. material
The restricted distribution of the species allows to know its EOO and AOO with reasonable confidence.
The species is probably restricted to the Selvagem Grande Island between Madeira and the Canary Islands, where it was found in an unnamed erosion coastal cave in 1958 (
The cosmopolitan congener O. navus is now commonly seen, even in caves, after being detected on the island for the first time before 1978. It is possible there is a gradual replacement of one species by the other, although this is for now only suspected.
The cosmopolitan congener O. navus is now commonly seen, even in caves, after being detected on the island for the first time before 1978. It is possible there is a gradual replacement of one species by the other, although this is for now only suspected.
If the suspicion that the introduction of O. navus is affecting O. selvagensis is confirmed, there is a single location derived from the spread of the invasive species in a single event.
Probably stable for the last 10 years.
The cosmopolitan congener O. navus is now commonly seen, even in caves, after being detected on the island for the first time before 1978. It is possible there is a gradual replacement of one species by the other, although this is for now only suspected.
No population size estimates exist.
A single subpopulation is historically known.
Only know from two caves.
The cosmopolitan congener O. navus is now commonly seen, even in caves, after being detected on the island for the first time before 1978. It is possible there is a gradual replacement of one species by the other, although this, for now, is only suspected.
It is probable that this is a species that lives underground due to the two known localities being inside of caves and it being largely depigmented. Congeners build small flat webs where they hunt for small insects.
The cosmopolitan O. navus may be outcompeting the species in part of its range.
The island of Selvagem Grande is part of the Selvagens Nature Reserve. If competition is confirmed, the invasive O. navus should be controlled. As this task is probably impossible, ex-situ conservation with eventual re-introduction and recovery might be the only feasible measure to prevent further reduction of O. selvagensis.
The current distribution of the species and possible threats from the invasive congener should be thoroughly studied. If outcompeted, O. selvagensis should be the target of a species conservation plan with consequent area management actions.
Kingdom | Phylum | Class | Order | Family |
---|---|---|---|---|
Animalia | Arthropoda | Arachnida | Araneae | Linyphiidae |
Possible junior synonym of Parapelecopsis nemoralioides (O. Pickard-Cambridge, 1884) (
Suppl. material
The species EOO and AOO are unknown.
Described from undefined locality in Madeira Island (
The species population size and trend are unknown.
The species habitat is unknown.
Unknown.
Unknown threats.
The species is not found since original description in 1899 (
Kingdom | Phylum | Class | Order | Family |
---|---|---|---|---|
Animalia | Arthropoda | Arachnida | Araneae | Philodromidae |
Suppl. material
Multiple collection sites are recorded for the species, mostly recent and in laurisilva forest (
Philodromus insulanus is known throughout the laurisilva forest that occupies about 20% of the island, mainly on its steep and humid northern slopes.
The preferred habitat of the species, humid laurisilva forest, is not experiencing any decline in area and the invasive species present should not affect the spider populations.
The preferred habitat of the species, humid laurisilva forest, is not experiencing any decline in area and the invasive species present should not affect the spider populations.
No known threats to the species.
The preferred habitat of the species, humid laurisilva forest, is not experiencing any decline in area and the invasive species present should not affect the spider populations.
No population size estimates exist.
Humid laurisilva forest on the northern slopes of Madeira Island.
The preferred habitat of the species, humid laurisilva forest, is not experiencing any decline in area and the invasive species present should not affect the spider populations.
The species is an active hunter at low to high vegetation feeding mainly on small size arthropods.
Unknown threats.
Most of the species range is inside the Madeira Natural Park.
Monitoring of population trends should be conducted to confirm species status.
Kingdom | Phylum | Class | Order | Family |
---|---|---|---|---|
Animalia | Arthropoda | Arachnida | Araneae | Philodromidae |
Suppl. material
The species EOO and AOO are unknown.
Only known from Pico Ruivo, the highest mountain in Madeira Island with 1861 m altitude (
No population size estimates exist.
The single site where the species was sampled is in high mountain above tree-line.
Nothing is known about the species but congeners are active hunters mainly feeding on small arthropods.
If this species is restricted to the high peaks of Madeira recent wildfires may have affected its population. Given the lack of information this is purely speculative.
If only living in the mountain peaks of Madeira, this species habitat is protected by the Madeira Natural Park.
Individuals of this species are not found since the original description (
Kingdom | Phylum | Class | Order | Family |
---|---|---|---|---|
Animalia | Arthropoda | Arachnida | Araneae | Pholcidae |
Suppl. material
The species EOO and AOO are unkown.
Pholcus dentatus is known from only two sites separated by 25 kms in the northern coast of Madeira Island between 300 and 450 meters elevation, Fonte da Pedra and Ribeira da Janela (
No population size estimates exist.
Habitat was never specified.
The species ecology is unknown but almost certainly a tangle-web builder feeding on small arthropods.
Unknown threats.
Basic information is needed on its distribution, ecology and possible threats.
Kingdom | Phylum | Class | Order | Family |
---|---|---|---|---|
Animalia | Arthropoda | Arachnida | Araneae | Pholcidae |
Suppl. material
Multiple collection sites are recorded for the species, mostly recent and in laurisilva forest (Wunderlich, 1987, unpublished). It was possible to perform species distribution modeling to predict its potential range with confidence limits. See methods for details.
Pholcus madeirensis was first described from the southern slopes of Madeira, including near Funchal, in undescribed habitat (
The preferred habitat of the species, humid laurisilva forest, is not experiencing any decline in area and the invasive species present should not affect the spider populations.
The preferred habitat of the species, humid laurisilva forest, is not experiencing any decline in area and the invasive species present should not affect the spider populations.
No known threats to the species.
The preferred habitat of the species, humid laurisilva forest, is not experiencing any decline in area and the invasive species present should not affect the spider populations.
No population size estimates exist.
Mainly humid laurisilva forest on the northern slopes of Madeira Island, but also known from the southern slopes in undescribed habitat.
The preferred habitat of the species, humid laurisilva forest, is not experiencing any decline in area and the invasive species present should not affect the spider populations.
The ecology of this species is unknown but almost certainly a tangle-web builder feeding on small arthropods.
Unknown threats.
Part of its range is inside the Madeira Natural Park.
Monitoring of population trends should be conducted to confirm species status. As the preferred habitat outside laurisilva forest is unknown, research on distribution and preferred habitats should be a priority.
Kingdom | Phylum | Class | Order | Family |
---|---|---|---|---|
Animalia | Arthropoda | Arachnida | Araneae | Pholcidae |
Suppl. material
The EOO and AOO of this species are unknown.
Only known from Portela, on eastern Madeira Island (
No population size estimates exist.
Only known from under a bridge surrounded by undescribed habitat (
The ecology of the species is unknown but almost certainly a tangle-web builder feeding on small arthropods.
Unknown threats.
Basic information is needed on its distribution, ecology and possible threats.
Kingdom | Phylum | Class | Order | Family |
---|---|---|---|---|
Animalia | Arthropoda | Arachnida | Araneae | Pholcidae |
Suppl. material
Four collection sites are recorded for the species, most recently in laurisilva forest close to the northern coast of Madeira (
Pholcus parvus is known from a few sites in laurisilva forest or nearby, always in valleys close to the northern coast of Madeira Island.
The preferred habitat of the species, humid laurisilva forest, is not experiencing any decline in area and the invasive species present should not affect the spider populations.
The preferred habitat of the species, humid laurisilva forest, is not experiencing any decline in area and the invasive species present should not affect the spider populations.
No known threats to the species.
The preferred habitat of the species, humid laurisilva forest, is not experiencing any decline in area and the invasive species present should not affect the spider populations.
No population size estimates exist.
Humid laurisilva forest on the northern valleys of Madeira Island.
The preferred habitat of the species, humid laurisilva forest, is not experiencing any decline in area and the invasive species present should not affect the spider populations.
The ecology of the species is unknown but almost certainly a tangle-web builder feeding on small arthropods.
Unknown threats.
Most of the species range is inside the Madeira Natural Park.
Monitoring of population trends should be conducted to confirm species status.
Kingdom | Phylum | Class | Order | Family |
---|---|---|---|---|
Animalia | Arthropoda | Arachnida | Araneae | Pholcidae |
Suppl. material
Multiple collection sites are recorded for the species, from both laurisilva forest and open areas above 450 m altitude (
Pholcus silvai is known on the western side of Madeira Island, from both laurisilva forest and open areas above 450 m altitude.
The preferred habitats of the species, humid laurisilva forest and open areas on the western side of the island, are not experiencing any decline in area and the invasive species present should not affect the spider populations.
The preferred habitats of the species, humid laurisilva forest and open areas on the western side of the island, are not experiencing any decline in area and the invasive species present should not affect the spider populations.
No known threats to the species.
The preferred habitats of the species, humid laurisilva forest and open areas on the western side of the island, are not experiencing any decline in area and the invasive species present should not affect the spider populations.
No population size estimates exist.
The species occurs in both laurisilva forest and open areas on the western side of the island.
The preferred habitats of the species, humid laurisilva forest and open areas on the western side of the island, are not experiencing any decline in area and the invasive species present should not affect the spider populations.
The ecology of this species is unknown but almost certainly a tangle-web builder feeding on small arthropods.
Unknown threats.
Most of the species range is inside the Madeira Natural Park.
Monitoring of population trends should be conducted to confirm this species' status.
Kingdom | Phylum | Class | Order | Family |
---|---|---|---|---|
Animalia | Arthropoda | Arachnida | Araneae | Linyphiidae |
Suppl. material
Only three collection sites have ever been recorded for this species, mostly from laurisilva forest (
Prinerigone pigra seems to be restricted to high-altitude forest (above 600 m) in Madeira Island.
There are no recent collections of the species. It does not seem to be common given the scarce number of records. Impossible to infer on the current trend.
There are no recent collections of the species. It does not seem to be common given the scarce number of records. Impossible to infer on the current trend.
Impossible to infer if there are any threats.
There are no recent collections of the species. It does not seem to be common given the scarce number of records. Impossible to infer on the current trend.
No population size estimates exist.
It seems to be mostly found in high-altitude laurisilva forest but possibly also in other habitats above 600m.
There are no recent collections of the species. It does not seem to be common given the scarce number of records. Therefore, it is impossible to infer the current trend.
Unknown, but sister taxa such as Prinerigone vagans (Audouin, 1826) are sheet-web weavers at ground and low vegetation levels.
Unknown threats.
Part of the species range is inside the Madeira Natural Park.
Basic information is needed on its distribution, ecology and possible threats.
Kingdom | Phylum | Class | Order | Family |
---|---|---|---|---|
Animalia | Arthropoda | Arachnida | Araneae | Theridiidae |
Suppl. material
Multiple collection sites are recorded for the species, mostly recent and in laurisilva forest (
Rugathodes madeirensis is one of the most common species in Madeira Island, known throughout the laurisilva forest and also other habitats including pine plantations and close to urban areas.
The species seems to be able to live within several habitat types, even close to human settlements.
The species seems to be able to live on several habitat types, even close to human settlements.
No known threats to the species.
The species seems to be able to live within several habitat types, even close to human settlements.
No population size estimates exist.
Rugathodes madeirensis is one of the most common species in Madeira Island, known throughout the laurisilva forest and also other habitats including pine plantations and close to urban areas.
Cobweb spider at all vegetation layers feeding on small arthropods.
Unknown threats.
Most of the species range is inside the Madeira Natural Park.
Monitoring of population trends should be conducted to confirm species status.
Kingdom | Phylum | Class | Order | Family |
---|---|---|---|---|
Animalia | Arthropoda | Arachnida | Araneae | Gnaphosidae |
Suppl. material
As the species is thought to be restricted to the three small islands/islets of Selvagens, the EOO and AOO can be calculated with some confidence.
Restricted to Selvagem Grande, Selvagem Pequena and Ilhéu de Fora in the archipelago of Selvagens.
The EOO seems to be stable with no signs of loss or known threats.
The AOO seems to be stable with no signs of loss or known threats.
No known threats to the species.
The population size seems to be stable with no signs of loss or known threats.
No population size estimates exist.
The islands and islets of Desertas have a mix of grassland and rocky outcrops within coastal cliffs. The species seems to be relatively common in grassland, unknown if also occurs in other habitats.
The habitat in Selvagem Grande was subject of a recovery plan during 2000-2002 and seems to be stable with no signs of loss or known threats.
This species is probably a nocturnal hunter of small arthropods at ground level.
Unknown threats.
The species range is inside the Selvagens Nature Reserve.
Monitoring of population trends should be conducted to confirm species status.
Kingdom | Phylum | Class | Order | Family |
---|---|---|---|---|
Animalia | Arthropoda | Arachnida | Araneae | Pholcidae |
Suppl. material
This species is only known from Selvagem Grande (
Only known from Selvagem Grande, from both a small coastal cave (Gruta das Pardelas) and rocky areas.
The EOO seems to be stable with no signs of loss or known threats.
The AOO seems to be stable with no signs of loss or known threats.
No known threats to the species.
The population size seems to be stable with no signs of loss or known threats.
No population size estimates exist.
Found both in a coastal cave and rocky outcrops.
This is a tangle-web spider hunting for small arthropods on rock walls.
Unknown threats.
The species range is inside the Selvagens Nature Reserve.
Monitoring of population trends should be conducted to confirm species status.
Kingdom | Phylum | Class | Order | Family |
---|---|---|---|---|
Animalia | Arthropoda | Arachnida | Araneae | Theridiidae |
Possible junior synonym of Steatoda paykulliana (Walckenaer, 1806), a widespread palearctic species (
Suppl. material
The EOO and AOO of this species are unknown.
Only mentioned for "Madeira" (
No population size estimates exist.
The species habitat is unknown.
Not much is known about this species ecology except it should be a cobweb builder (if the species is valid).
Unknown threats.
S. distincta probably is a synonym of a widespread species (
Kingdom | Phylum | Class | Order | Family |
---|---|---|---|---|
Animalia | Arthropoda | Arachnida | Araneae | Linyphiidae |
Suppl. material
Multiple collection sites are recorded for the species, mostly recent and in laurisilva forest (
Tenuiphantes tenebricoloides is one of the most common species in Madeira Island, known throughout the laurisilva forest and also other habitats including planted/cultivated forest and close to urban areas.
Although most common in laurisilva forest, the species seems to be able to live on several habitat types, even close to human settlements.
Although most common in laurisilva forest, the species seems to be able to live on several habitat types, even close to human settlements.
No known threats to the species.
Although most common in laurisilva forest, the species seems to be able to live on several habitat types, even close to human settlements.
No population size estimates exist.
Most common in humid laurissilva forest but recorded from several habitat types.
Although most common in laurisilva forest, the species seems to be able to live on several habitat types such as cultivated forest, even close to human settlements.
This species is a sheet-web builder at the arboreal layer feeding mainly on small insects.
Unknown threats.
Most of the species range is inside the Madeira Natural Park.
Monitoring of population trends should be conducted to confirm species status.
Kingdom | Phylum | Class | Order | Family |
---|---|---|---|---|
Animalia | Arthropoda | Arachnida | Araneae | Mysmenidae |
Suppl. material
Multiple collection sites are recorded for the species, mostly recent and in laurisilva forest (
Trogloneta madeirensis is one of the most common species in Madeira Island, known throughout the laurisilva forest and also other habitats including caves and close to urban areas.
Although most common in laurisilva forest, the species seems to be able to live on several habitat types, even close to human settlements.
Although most common in laurisilva forest, the species seems to be able to live on several habitat types, even close to human settlements.
No known threats to the species.
Although most common in laurisilva forest, the species seems to be able to live on several habitat types, even close to human settlements.
No population size estimates exist.
Most common in humid laurissilva forest but recorded from several habitat types.
Although most common in laurisilva forest, the species seems to be able to live on several habitat types, even close to human settlements.
This tiny spider has been found living among the rocks and trees, shrubs and herbs and also in moss on tree trunks (
Unknown threats.
Most of the species range is inside the Madeira Natural Park.
Monitoring of population trends should be conducted to confirm species status.
Kingdom | Phylum | Class | Order | Family |
---|---|---|---|---|
Animalia | Arthropoda | Arachnida | Araneae | Linyphiidae |
Suppl. material
Multiple collection sites are recorded for the species, mostly recent and in laurisilva forest (
Turinyphia maderiana is known throughout the laurisilva forest that occupies about 20% of the island, mainly on its steep and humid northern slopes.
The preferred habitat of the species, humid laurisilva forest, is not experiencing any decline in area and the invasive species present should not affect the spider populations.
The preferred habitat of the species, humid laurisilva forest, is not experiencing any decline in area and the invasive species present should not affect the spider populations.
No known threats to the species.
The preferred habitat of the species, humid laurisilva forest, is not experiencing any decline in area and the invasive species present should not affect the spider populations.
No population size estimates exist.
Humid laurisilva forest on the northern slopes of Madeira Island.
The preferred habitat of the species, humid laurisilva forest, is not experiencing any decline in area and the invasive species present should not affect the spider populations.
This species is a sheet-web builder at different vegetation levels feeding mainly on small insects.
Unknown threats.
All of the species range is inside the Madeira Natural Park.
Monitoring of population trends should be conducted to confirm species status.
Kingdom | Phylum | Class | Order | Family |
---|---|---|---|---|
Animalia | Arthropoda | Arachnida | Araneae | Linyphiidae |
Suppl. material
Multiple collection sites are recorded for the species, all recent and in open habitats (
Living on relatively high-altitude open areas across Madeira (Paúl da Serra and the region between the highest mountain peaks), Deserta Grande (south plateau) and Bugio (south and north plateaus).
The species seems to be able to live on open habitat patches across different islands.
The species seems to be able to live on open habitat patches across different islands.
No known threats to the species.
The species seems to be able to live on open habitat patches across different islands.
No population size estimates exist.
The species seems to be able to live within different open habitat types, including grassland and rocky mountain peaks.
The species seems to be able to live on open habitat patches across different islands.
Living at ground level, probably actively hunting for small insects.
Unknown threats.
Most of the known species range is inside protected areas.
Monitoring of population trends should be conducted to confirm species status.
Kingdom | Phylum | Class | Order | Family |
---|---|---|---|---|
Animalia | Arthropoda | Arachnida | Araneae | Thomisidae |
Suppl. material
Species possibly restricted to the islands of Deserta Grande and Bugio (
This species is possibly restricted to the islands of Deserta Grande and Bugio where it is know from three sites but probably extends across the entire islands given the adequate microhabitat (steep slopes).
Although the invasive Xysticus nubilus Simon, 1875, first detected in 2011, seems to have occupied all the flat areas of Desertas, the steep slopes around the islands may constitute refuge to this single island endemic.
Although the invasive X. nubilus seems to have occupied all the flat areas of Desertas, the steep slopes around the islands may constitute refuge to this single island endemic.
A single event, the introduction of the invasive species X. nubilus, first detected in 2011, seems to have originated the extirpation of X. grohi from most of the islands. This invasive process may continue in the future to the current refuge of the endemic species, the steep coastal slopes.
The introduction of the invasive congener X. nubilus seems to have originated the extirpation of X. grohi from most of the islands. This invasive process may continue in the future to the current refuge of the endemic species, the steep coastal slopes.
No population size estimates exist. The introduction of the invasive X. nubilus seems to have originated the extirpation of X. grohi from most of the islands. This invasive process may continue in the future to the current refuge of the endemic species, the steep coastal slopes.
The introduction of X. nubilus seems to have originated the extirpation of X. grohi from most of the islands.
This species is possibly restricted to rocky areas, now only on coastal slopes.
The introduction of X. nubilus seems to have originated the extirpation of X. grohi from most of the islands.
This species is an ambush hunter of small insects over rocks and possibly low vegetation.
The introduction of the invasive species X. nubilus, first detected in 2011, seems to have originated the extirpation of X. grohi from most of the islands. This invasive process may continue in the future to the current refuge of the endemic species, the steep coastal slopes.
All of the species range is inside the Desertas Nature Reserve. The invasive X. nubilus should be erradicated from the island. As this task is probably impossible, ex-situ conservation with eventual re-introduction and recovery might be the only feasible measure to prevent the species extinction.
The current distribution of the species and possible threats from the invasive congener should be thoroughly studied. X. grohi should be the target of a species conservation plan with consequent area management actions. Monitoring of population trends should be conducted to confirm the species status.
Kingdom | Phylum | Class | Order | Family |
---|---|---|---|---|
Animalia | Arthropoda | Arachnida | Araneae | Thomisidae |
Suppl. material
This species EOO and AOO are unknown.
This species is only known from Fajã da Nogueira at the northeastern region of Madeira Island in laurisilva forest (Fig.
No population size estimates exist.
Only known from laurisilva forest.
As all congeners, certainly an ambush hunter feeding on small insects.
Unknown threats.
The known species range is inside the Madeira Natural Park.
Basic research is needed on its distribution, ecology and possible threats throughout the range.
Suppl. material
Multiple collection sites are recorded for the species, mostly recent and in open grassland or shrubland (
Known from all islands and few islets of Madeira and Selvagens archipelagos. Always at low altitude in open habitats such as grassland or shrubland.
The species seems to be able to live on several habitat types, even close to human settlements.
The species seems to be able to live on several habitat types, even close to human settlements.
No known threats to the species.
The species seems to be able to live on several habitat types, even close to human settlements.
No population size estimates exist.
Open grassland and shrubland, often in disturbed areas, close to or even inside houses.
Most probably an active hunter at ground level feeding on small size arthropods.
Unknown threats.
Part of the species range is inside several protected areas
Monitoring of population trends should be conducted to confirm species status.
Out of 56 species evaluated (Hogna ingens included), there is no reliable information on range and trends for 16 (29%). Among the 40 with reliable information, 29 are widespread, with an estimated EOO > 200 km2 and AOO > 60 km2. Most of these are restricted to the laurisilva forest that occupies 20% of the area of Madeira Island and which is well preserved and protected for the most part.
Seven species show a continuing decline in either range or population size. Their decline can be attributed to habitat destruction or degradation (Centromerus anoculus and C. sexoculatus, both exclusive to degraded caves), plant invasive species that reduce the habitat quality (Dysdera portisancti and H. ingens), wildfires at high mountain regions (Mesiotelus maderianus) and possible competition for resources from congeners (Meta barreti and Xysticus grohi).
The tetragnathid M. barreti is considered as possibly extinct due to the suspected impact of a competing species. Other than habitat destruction, competing species have been found to be the major menace for threatened spiders in Macaronesia (
A few species are missing critical information to be able to assess their status, namely a couple that are only known from the high peaks of Madeira Island (Drassodes rugichelis and Philodromus simillimus). While all other habitats have been subject to multiple recent projects using standardized intensive sampling, the mountain regions have been sporadically sampled, rarely in recent times. This habitat, known to host multiple endemic species of other taxa such as snails and beetles, was subjected to catastrophic wildfires in 2010 that affected many threatened endemics, and should therefore be the focus for future work with spiders. Furthermore, it will also be important to assess the vulnerability of these mountain habitats and their associated spider fauna to climate change effects.
The effects of climate change, one of the prevailing threats accross the world affecting numerous species, was never studied for Madeira and Selvagens spiders. This is a known threat to Macaronesian bryophytes (
Among all the conservation measures suggested, the restoration of original habitat areas and control of invasive species are often a priority to guarantee the survival of threatened species. Many actions have been undertaken by the local authorities (Instituto das Florestas e da Conservação da Natureza) in Madeira and Selvagens archipelagos to control and eradicate invasive plants and mammals jointly with habitat restoration programs. However, it is important not only to ensure the continuity of those actions, but also to monitor their effectiveness by assessing population changes in selected groups like spiders as they already proved to be efficient and effective bioindicators in many terrestrial ecosystems (
The network of protected areas in Madeira and Selvagens archipelagos is extensive and covers most of the areas known to harbour higher values of species richness and endemism (
In conclusion, although most endemic spiders from Madeira and Selvagens archipelagos are in a favourable situation due to the good condition and protection of the laurisilva forests where many live, there are a number of species requiring urgent attention and protection measures. These include the few cave and mountain-restricted species or threatened by competing congeners or invasive plants. Extending current protected areas, restoring original habitats of threatened species and control invasive taxa are still a priority.
Sérgio Henriques, Nicola Mumford and Pavel Stoev provided significant input that much improved the paper. We thank Instituto das Florestas e da Conservação da Natureza (IFCN) for logistic support and permissions for sampling in Madeira and Selvagens. We are also grateful to Fundação para a Ciência e a Tecnologia (FCT, Portugal) for the financial support through projects PDCT/BIA-BDE/59202/2004, PTDC/BIA-BEC/99138/2008 and FCT-PTDC/BIABIC/0054/2014 and grant SFRH/BPD/86215/2012 to MB. Team members of the three abovementioned projects and nature rangers of the IFCN were a great help during field and laboratorial work.
Toyota Global Species Programme