Fauna Europaea: Hymenoptera – Apocrita (excl. Ichneumonoidea)

Abstract Fauna Europaea provides a public web-service with an index of scientific names (including important synonyms) of all living European land and freshwater animals, their geographical distribution at country level (up to the Urals, excluding the Caucasus region), and some additional information. The Fauna Europaea project covers about 230,000 taxonomic names, including 130,000 accepted species and 14,000 accepted subspecies. This represents a huge effort by more than 400 contributing specialists throughout Europe and is a unique (standard) reference suitable for many users in science, government, industry, nature conservation and education. Hymenoptera is one of the four largest orders of insects, with about 130,000 described species. In the Fauna Europaea database, ‘Hymenoptera - Apocrita (excluding Ichneumonoidea)’ comprises 13 superfamilies, 52 families, 91 subfamilies, 38 tribes and 13,211 species. The paper includes a complete list of taxa dealt with, the number of species in each and the name of the specialist responsible for data acquisition. As a general conclusion about the European fauna of Hymenoptera, the best known countries in terms of recorded species are those from northwestern Europe, with the least known fauna probably in the more eastern and southeastern parts of Europe.


Introduction
The European Commission published the European Community Biodiversity Strategy, providing a framework for development of Community policies and instruments in order to comply with the Convention on Biological Diversity. The Strategy recognises the current incomplete state of knowledge at all levels concerning biodiversity, which is a constraint on the successful implementation of the Convention. Fauna Europaea contributes to this Strategy by supporting one of the main themes: to identify and catalogue the components of European biodiversity into a database to serve as a basic tool for science and conservation policies.
In regard to biodiversity in Europe, science and policies depend on knowledge of its components. The assessment of biodiversity, monitoring changes, sustainable exploitation of biodiversity, and much legislative work depends upon a validated overview of taxonomic biodiversity, in which Fauna Europaea plays a major role, providing a web-based information infrastructure with an index of scientific names (including important synonyms) of all living European land and freshwater animals, their geographical distribution at country level and some additional optional information. In this sense the Fauna Europaea database provides a unique reference for many user-groups such as scientists, governments, industries, conservation communities and educational programs.
Fauna Europaea kicked-off in 2000 as an EC-FP5 four years project, delivering its first release in 2004(Jong et al. 2014. After thirteen years of steady progress, in order to efficiently disseminate the Fauna Europaea results and to increase the acknowledgement of the Fauna Europaea contributors, novel e-Publishing tools have been applied to prepare data-papers of all major taxonomic groups. For this purpose a special Biodiversity Data Journal Series has been compiled, called Contributions on Fauna Europaea. This work was initiated during the ViBRANT project and is further supported by the recently started EU BON project. This paper holds the first publication of the Fauna Europaea Hymenoptera -Apocrita (excluding Ichneumonoidea) data sector as a BDJ data paper.
Within the EU BON project further steps will be made to implement Fauna Europaea as a basic tool and standard reference for biodiversity research and to evaluate taxonomic expertise capacity in Europe. The Fauna Europaea data-papers will contribute to a quality assessement on biodiversity data by providing estimates on gaps in taxonomic information and knowledge. The ecology and biology of the species from the above families are extremely diverse. In their larval stage most species are carnivorous, feeding mainly on other insects or spiders, but some groups are specialized on other diets such as nectar and pollen (e.g. Apidae), vegetable tissues (e.g. Cynipidae), or are omnivorous (e.g. Formicidae). Among the carnivorous species, most are parasitoids i.e. the free-living adult usually searches a host (the egg, larva, pupa, or even the adult of mostly another insect) and its larva (solitary parasitoid) or larvae (gregarious parasitoid) will then develop inside (endoparasitoid) or outside (ectoparasitoid) that host, almost invariably killing it.  FaEu Hymenoptera-Apocrita (excluding Ichneumonoidea) species per family. See Table 1 for family statistics. Fauna Europaea geographic coverage ('minimal Europe').
Fauna Europaea: Hymenoptera -Apocrita (excl. Ichneumonoidea) In the Fauna Europaea database, Hymenoptera -Apocrita (excluding Ichneumonoidea) comprises 13 superfamilies, 54 families and 91 subfamilies (see taxonomic coverage). Some recent changes in the classification of Hymenoptera Apocrita will be included in the next version, such as the treatment of Scelionidae as a subfamily of Platygastridae (Scelioninae) (Sharkey 2007), the inclusion of Cratomus Dalman and Panstenon Walker (Pteromalidae: Cratominae, Panstenoninae) in Pteromalinae, the inclusion of Epichrysomallinae in Pteromalidae (Heraty et al. 2013), etc. A different classification system for Apoidea (such as the one in Checklist of the Western Palaearctic Bees) will also be considered following a consensus decision of bee specialists.

Fig. 4
Gap estimates in Fauna Europaea: Despite recent progress, it is important to note that we still know very little of the fauna of Hymenoptera for Europe. It is almost certain (if we use the UK fauna -by far the best known in Europe -as a guide and extrapolate from there) that the order Hymenoptera, in terms of species richness, would be far greater than that for Coleoptera. Currently the British Isles fauna of Hymenoptera stands at 7761 species, being the largest insect order in the region, ahead of Coleoptera and Diptera (Broad 2014).
Estimated gaps in terms of described species that are known from Europe, but are not currently included in the database are presented in Table 1. They range from zero for many families up to about 5-10% for other groups, and are expected to be filled in the next version of the database. Country gaps are not included in this analysis, but are expected to be higher in south-eastern European countries, where studies of Hymenoptera Apocrita fauna are still scarce compared with the north-western countries. The best known countries in Europe are probably UK (<80%), Sweden (<50%), ex Czechoslovak Republic (<50%), Germany (<50%), Italy (<50%), France (<30%), and Spain (<30%), with the least known fauna probably in the more eastern and southeastern parts of Europe such as Romania, Bulgaria, or Greece (probably all <20%) (Noyes, unpublished data).
With regard to the undescribed taxa, it would be generally highly speculative to estimate the potential number of new species for most families, especially for highly diverse groups containing minute species, such as Chalcidoidea, where possibly hundreds of new species await discovery. For other better studied groups such as Chrysididae, it is estimated that a large number of subspecies could be errected to species level, thus increasing the total number of valid taxa with about 50 species. In other groups it is also possible that the number of new synonyms will proove to be approximately equal to the number of newly described taxa, so that the total number of taxa will not become significantly higher. In addition, the number of taxonomists is continuously decreasing: unfortunatelly some excellent specialists are either deceased (Dr Till Osten and Dr Guido Nonveiller) or are retired and inactive (Table 2). If young taxonomists will not fill up these gaps, we will eventually end up not being able to identify most of the European biodiversity.  Personel: The taxonomic framework of Fauna Europaea includes partner institutes providing taxonomic expertise and information, and expert networks managing data collation.
Every taxonomic group is covered by at least one Group Coordinator responsible for the supervision and integrated input of taxonomic and distributional data of a particular group. For Hymenoptera -Apocrita the responsible Group Coordinators were John Noyes (version 1) and Mircea-Dan Mitroiu (version 2).
The Fauna Europaea checklist would not have reached its current level of completion without the input from several groups of specialists. The formal responsibility of collating and delivering the data of relevant families has resided with the Taxonomic Specialists (see Table 1 Design description: Standards. Group coordinators and taxonomic specialists have to deliver the (sub)species names according to strict standards. The names provided by FaEu are scientific names. The taxonomic scope includes issues like (1) the definition of criteria used to identify the accepted species-group taxa, (2) the hierarchy (classification scheme) for the accommodation of the all accepted species, (3) relevant synonyms, and (4) the correct nomenclature. The Fauna Europaea ' Guidelines for Group Coordinators and Taxonomic Specialists', include the standards, protocols, scope, and limits that provide the instructions for all of the more than 400 specialists contributing to the project.
Data management. The data could either be entered offline into a preformatted MS-Excel worksheet or directly into the Fauna Europaea transaction database using an online browser interface (see Fig. 1). Since 2013 the data servers are hosted at the Museum für Naturkunde in Berlin (migrated from ZMA-UvA). For preparing the Hymenoptera -Apocrita (excluding Ichneumonoidea) data-paper additional support was received from a grant of the Romanian National Authority for Scientific Research, CNCS-UEFISCDI, project number PN-II-RU-TE-2012-3-0057 to MDM.

Sampling methods
Study extent: See spatial coverage and geographic coverage descriptions.
Sampling description: Fauna Europaea data have been assembled by principal taxonomic experts, based on their individual expertise, including literature study, collection research, and field observations. In total no fewer than 476 experts contributed taxonomic and/or faunistic information for Fauna Europaea. The vast majority of these experts are from Europe (including EU non-member states). As a unique feature, Fauna Europaea funds were set aside for paying/compensating for the work of taxonomic specialists and group coordinators (around five Euro per species).
To facilitate data transfer and data import, sophisticated on-line (web interfaces) and offline (spreadsheets) data-entry routines have been built, well integrated within an underlying central Fauna Europaea transaction database (see Fig. 1). This includes advanced batch data import routines and utilities to display and monitor the data processing within the system. In retrospect, it seems that the off-line submission of data was probably the best for bulk import during the project phase, while the on-line tool was preferred to enter modifications in later versions. This system worked well until its replacement in 2013.  Further, all Fauna Europaea data sets are intensively reviewed at regional and thematic validation meetings, at review sessions on taxonomic symposia (for some groups), by Fauna Europaea Focal Points (during the FaEu-NAS and PESI projects) and by various end-users sending annotations using the web form on the web-portal. Additional validation on gaps and correct spelling was effected at the validation office in Paris.
Checks on technical and logical correctness of the data have been implemented in the data entry tools, including around 50 "Taxonomic Integrity Rules". This validation tool proved to be of huge value for both the experts and project management, and significantly contribute(d) to preparation of a remarkably clean and consistent data set. This thorough reviewing makes Fauna Europaea the most scrutinised data sets in its domain.
In conclusion (see above), recognised gaps in Hymeneoptera -Apocrita (excluding Ichneumonoidea) include: slow up-dating of data-sets (with both faunistic and taxonomic information) for several groups e.g. Apidae or Cynipoidea; and few faunistic data for some groups e.g. Chalcidoidea, Platygastroidea or Proctotrupoidea, especially in south-eastern European countries.
To optimise the use and implementation of a uniform and correct nomenclature, also following the global efforts on establishing a so-called 'Global Names Architecture' Michel 2008, Patterson et al. 2010), a cross-referencing of the Fauna Europaea Hymenoptera -Apocrita (excluding Ichneumonoidea) data-set with relevant nomenclators, including the Universal Chalcidoidea Database, is recommended as well as a connection with relevant name services (like Hymenoptera Name Server). In addition, a interlinkage with relevant Hymenoptera information services (like Hymenoptera Online, Atlas Hymenoptera, BWARS and HymIS), regional data portals (like Forum Entomologi Italiani and eBiodiversity) and databases dedicated to smaller groups (like Chrysis.net, Bombus, P alaearctic Osmiine Bees and Checklist of the Western Palaearctic Bees) is proposed. Fig. 7 Step description: By evaluating team structure and life cycle procedures (data-entry, validation, updating, etc.), clear definitions of roles of users and user-groups, according to the taxonomic framework were established, including ownership and read and write privileges, and their changes during the project life-cycle. In addition, guidelines on common data exchange formats and codes have been issued (see also the 'Guidelines' document).

Geographic coverage
Description: Species and subspecies distributions in Fauna Europaea are registered at least at country level, defined politically. For this purpose the FaEu geographical system basically follows the TDWG 2.0 standards. The covered area includes the European mainland (Western Palaearctic), plus the Macaronesian islands (excl. Cape Verde Islands), Cyprus, Franz Josef Land and Novaya Zemlya. Western Kazakhstan and the Caucasus are excluded (see Fig. 3).
The focus is on species (or subspecies) of European multicellular animals of terrestrial and freshwater environments. Species in brackish waters, occupying the marine/freshwater or marine/terrestrial transition zones, are generally excluded. This data paper covers the Hymenoptera -Apocrita (excluding Ichneumonoidea) content of Fauna Europaea, including 52 families, 13,211 species, 826 subspecies and 5,676 (sub)species synonyms (see Fig. 2). Higher ranks are given below, the species list can be downloaded from the Fauna Europaea portal (see: Data resources).