Biodiversity Data Journal :
Taxonomic paper
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A second update to the checklist of Finnish long-legged flies (Diptera: Dolichopodidae), with a re-evaluation of the status of Hydrophorus callosoma Frey, 1915
Corresponding author:
Academic editor: Torsten Dikow
Received: 01 Aug 2013 | Accepted: 04 Oct 2013 | Published: 28 Oct 2013
© 2013 Jere Kahanpää
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation:
Kahanpää J (2013) A second update to the checklist of Finnish long-legged flies (Diptera: Dolichopodidae), with a re-evaluation of the status of Hydrophorus callosoma Frey, 1915. Biodiversity Data Journal 1: e976. https://doi.org/10.3897/BDJ.1.e976
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Eighteen species of long-legged flies (Dolichopodidae) are reported as new to Finland. A further species, Microphorella praecox (Loew), is confirmed as a Finnish species. The status of Hydrophorus callosoma Frey, 1915 is re-evaluated and a lectotype is designated for the species. H. albosignatus Ringdahl, 1919 is found to be a junior synonym of H. callosoma (syn. n.). Characters for identifying both sexes of H. callosoma and H. altivagus Aldrich are presented and illustrated with high-quality photographs.
Diptera, Dolichopodidae, Hydrophorus, Finland, new synonym, lectotype designation, faunistics
The latest checklist of Finnish long-legged flies (Diptera: Dolichopodidae) was published nearly ten years ago (
This paper summarizes the changes that have occurred since the last update. A grand total of 18 species are added to the list of Finnish Dolichopodidae, bringing the total up to 264 species. The dolichopodid fauna of Finland is relatively well known, but at least 10-20 additional species can still be expected to occur in the country.
It should be noted that the former family Microphoridae, excluded from the previous national dolichopodid checklist but included in
The material examined is stored in the Finnish Museum of Natural History, University of Helsinki (MZH) and the author's private collection.
Stack photographs of Hydrophorus specimens were taken using a Canon EOS digital camera and a Canon MP-E 65 mm macro lens. To create a final photograph, 35-40 exposures of each subject were combined using the CombineZ program (
Scattered records across north and central Europe from Finland to Italy (
Hydrophorus wahlbergi var.(?) callosoma
Hydrophorus albosignatus
Hydrophorus callosoma is externally most like H. altivagus Aldrich, 1911 (=H. wahlgreni Frey, 1915). Both sexes can be identified by the armature on fore femora: there is only a single short row of 6-13 small ventral spines in the basal third of the fore femur. Anteroventral spines missing or at most 1-3 very short ones present (usually completely absent in females). H. altivagus has a row of strong anteroventral spines reaching the apical third of the femur in addition to the ventral spines. Other differences between the two species are tabulated in Table
Character table for distinguishing H. callosoma Frey from H. altivagus Aldrich. See Figs
character | H. callosoma Frey | H. altivagus Aldrich |
---|---|---|
face | wide, parallel-sided | narrower, broadened towards the clypeus |
face, colour (males only) | silver, narrowly greenish under the antennae | green ground color obscured by silver only in the lower third-half |
clypeus, shape | width of clypeus not much less than the height of face | width of clypeus clearly less than height of face |
fore femur | one compact row of 6-13 ventral setae restricted to the basal third or half. Anteroventral setae missing or at lost 1-3 small, scattered ones | venrtal row with 3-8 sete in basal half. Anteroventral row of setae well developed, with 6-12 setae, reaching the apical third |
wing color (females only) | wings almost transparent in both sexes | wing membrane faintly brownish esp. before vein M1+2 |
spot above notopleural depression | white, round or oval in dorsal view | variable, usually small, dark to yellow, linear along notopleural suture. Never white and round |
abdomen (females only) | lateral hairs of tergites 5 at let partially white in dorsal view. Usually also tergites 3-4 with partially pale lateral hairs | lateral hairs (in dorsal view) on tergites 3-5 black. Note that the ventral hairs on tergites are usually white. |
Sweden, Finland and North-Western Russia (Murmansk and Archangelsk Oblasts).
Richard Frey described Hydrophorus callosoma as a variety of on the basis of two female specimens. He did, however, express doubt about it's true status. The name has later been synonymed with H. wahlberg Frey, 1915 (
The type material of H. callosoma Frey consists of two females deposited in MZH. The lectotype (here designated), a female from Kantalaks (=Kandalaksha, Russia), is identical with H. albosignatus Ringdahl, 1919 (Figs
Hydrophorus specimens, lateral view. Left column: H. callosoma Frey. Right column: H. altivagus Aldrich.
Hydrophorus specimens, dorsal view. Left column: H. callosoma Frey. Right column: H. altivagus Aldrich.
Hydrophorus specimens, face and fore femora. Left column: H. callosoma Frey. Right column: H. altivagus Aldrich.
Frey's H. callosoma type material was compared with a single female paralectotype of H. albosignatus Ringdahl, 1919 (see Figs
The Kantalaks specimen is here designated as the lectotype of H. callosoma Frey, 1915. This choice is made because only this specimen does actually match Frey's original description "...near the previous species [=H. wahlbergi], from which is differs by its much more brilliant coloration and the pale hairs on the sides of the abdomen" (
H. callosoma Frey, 1915 is thus a senior synonym of H. albosignatus Ringdahl, 1919 and becomes the valid name for this species (syn. nov.).
New to Finland. Global distribution poorly known due to confusion with M. muralis (Fallén, 1823) (
Medetera belgica was based on a single female
New to Finland. Previously known from Estonia and Russia (
New to Finland. Previously known from Russia (Archangelsk Oblast) and Estonia (
New to Finland. Previously reported from Norway, Belgium, Switzerland, France, south Russia (
New to Finland. Previously known from Russia, Estonia, Lithuania and Norway (
New to Finland. A rare species previously known from Sweden and Alaska (
= Dolichopus cilifemoratus Macquart, 1827
= Dolichopus pseudocilifemoratus Stackelberg, 1930
New to Finland. Widespread in Europe, but many records should be confirmed due to the frequent misuse of this name for Dolichopus trivialis Haliday, 1832 (
This name has a confused history of use, which can be traced back to
New to (present-day) Finland. Previously recorded as Finnish based on specimens from areas ceded to Russia after the second world war (
A species of eutrophic calcareous spring-fed fens in northern Finland.
New to Finland. Also known from Sweden, Norway and Asian Russia (
New to Finland. Widespread in Europe north of the Alps (
New to Finland. Widespread in Europe, also known from the Near East (
New to Finland. An east European species, previously recorded from Austria, Hungary, European Russia and Ukraine (
Caught on the silt banks of a small stream in a herb-rich forest.
New to Finland. Widespread in Europe reaching the Near East and Siberia (
New to Finland. Widespread in Europe, reaching the Middle East (
New to Finland. Previously known from Sweden and Russian East Siberia (
C. femoratus is common and occasionally abundant along forest streams in the central boreal zone of Finland. Its rarity in museum collections is explained by the combination of a northern distribution, an early/late occurrence of the adults and a species-poor habitat often skipped by collectors of Dolichopodidae: the adults are on the wing in May and September when these forests may still have a partial snow cover.
New to Finland. Previously known from NW Russia, Germany and Spain (
Identified using
New to Finland. Previously found in the United Kingdom, Germany, Switzerland, France, the Czech Republic and Slovakia (
Locally common on open seashore or lakeshore wetlands characterised by Potentilla palustris intermixed with large Carex species. Unlike Achalcus flavicollis (Meigen, 1824) and Achalcus vaillanti Brunhes, 1987, A. nigropunctatus is only rarely caught in pure Phragmites stands.
A part of this study is based on material collected during the Research Programme of Deficiently Known and Threatened Forest Species 2003–2007 (PUTTE) by the author, Jari Ilmonen and Jevgeni Jakovlev. I would also like to thank Dr. Dan Bickel for his valuable comments on taxonomy of Medera and entomological nomenclature.