Key to long horn bee species of the tribe Eucerini (Hymenoptera, Apoidea, Apidae) occurring in Europe

Keywords: insects, biodiversity, pollinators, taxonomy, systematics

Abstract

Europe hosts some 2180 wild bee species, representing ca 10% of the world bee diversity. The long horn bee tribe Eucerini (Hymenoptera, Apidae) is one of the most charismatic groups in this region, and is particularly diverse in the southern, Euro-Mediterranean region. While identification of most species is difficult, a comprehensive identification tool has largely been missing, but is essential for current monitoring programs. This work presents the first modern comprehensive key to species of the tribe Eucerini in Europe. Keys are provided separately for females and males, including 89 out of the 112 species of Eucerini listed in the most updated checklist of the bees of Europe. The keys comprise new morphological delimitations for numerous species, particularly in the female sex, to resolve gaps in species identification, including some long known and widely distributed species. In addition, species are presented in the keys in context of genera, subgenera, and previously recognised species groups, when this is possible.

References

Amiet F., Herrmann M., Müller A. & Neumeyer R. 2007. Apidae 5: Ammobates, Ammobatoides, Anthophora, Biastes, Ceratina, Dasypoda, Epeoloides, Epeolus, Eucera, Macropis, Melecta, Melitta, Nomada, Pasites, Tetralonia, Thyreus, Xylocopa. Fauna Helvetica 20, Centre suisse de cartographie de la faune, Schweizerische Entomologische Gesellschaft, Neuchâtel.

Aubert M. 2020. Proposition de clé d’identification des Eucerini (Hymenoptera: Anthophila) de France continentale – version provisoire. Observatoire des Abeilles. Available from https://oabeilles.net/projets/eucerini [accessed 24 Oct. 2025].

Dalla Torre C.G. de. 1896. Catalogus Hymenopterorum Vol. 10: Apidae (Anthophila). G. Engelmann, Leipzig [Lipsiae]. https://doi.org/10.5962/bhl.title.10348

Dorchin A. 2019. Taxonomic revision of the aequata-group of the subgenus Eucera s. str. (Hymenoptera, Apidae, Eucerini). Zootaxa 4652 (3): 457–472. https://doi.org/10.11646/zootaxa.4652.3.3

Dorchin A. 2023. Revision of the historical type collections of long-horn bees (Hymenoptera: Apidae: Eucerini) preserved in the Muséum national d’Histoire naturelle, Paris. Annales de la Société entomologique de France 59 (2): 115–149. https://doi.org/10.1080/00379271.2023.2192693

Dorchin A. & Michez D. 2024. Species of the Western Palaearctic genus Tetralonia Spinola, 1838 (Hymenoptera, Apidae) with atypical pollen hosts, with a key to the pollinosa-group, description of new species, and neotype designation for Apis malvae Rossi, 1790. Taxonomy 4: 126–149. https://doi.org/10.3390/taxonomy4010007

Dorchin A., López-Uribe M.M., Praz C.J., Griswold T. & Danforth B.N. 2018. Phylogeny, new generic-level classification, and historical biogeography of the Eucera complex (Hymenoptera: Apidae). Molecular Phylogenetics and Evolution 119: 81–92. https://doi.org/10.1016/j.ympev.2017.10.007

Freitas F.V., Branstetter M.G., Franceschini-Santos V.H., Dorchin A., Wright K.W., López-Uribe M.M., Griswold T., Silveira F.A. & Almeida E.A.B. 2023. UCE phylogenomics, biogeography, and classification of long-horned bees (Hymenoptera: Apidae: Eucerini), with insights on using specimens with extremely degraded DNA. Insect Systematics and Diversity 7 (4): 3. https://doi.org/10.1093/isd/ixad012

Friese H. 1896. Die Bienen Europa’s (Apidae europaeae) nach ihren Gattungen, Arten und Varietäten auf vergleichend morphologisch-biologischer Grundlage bearbeitet. Vol. 2: Solitäre Apiden. Genus Eucera. R. Friedländer & Sohn, Berlin.

Germar E.F. 1839. Fauna Insectorum Europæ. Vol. 21. Kümmel, Halle [Halae].

Ghisbain G., Rosa P., Bogusch P., Brau T., Carion F., De Manincor N., Devalez J., Dorchin A., Flaminio S., Greil H., Hölzler G., Hopfenmüller S., Kasparek M., Kuhlmann M., Le Divelec R., Litman J., Michez D., Müller A., Ortiz-Sánchez F.J., … & Reverté S. 2025. The new annotated checklist of the wild bees of Europe (Hymenoptera: Anthophila) — version 2025. Zootaxa 5736 (1): 1–126. https://doi.org/10.11646/zootaxa.5736.1.1

Horn W. & Schenkling S. 1928–1929. Index Literaturae Entomologicae. Vol. I: Die Welt-Literatur über die gesamte Entomologie bis inklusive 1863. Selbstverlag W. Horn, Berlin-Dahlem.

Latreille, P.A. 1802. Histoire naturelle générale et particulière des Crustacés et des Insectes, Vol. 3. F. Dufart, Paris. https://doi.org/10.5962/bhl.title.15764

Michener C.D. 2000. The Bees of the World. The Johns Hopkins University Press, Baltimore, Maryland, USA.

Michener, C.D. 2007. The Bees of the World, 2nd Ed. The Johns Hopkins University Press, Baltimore, MA, USA.

Michez D., Rasmont P., Terzo M. & Vereecken N.J. 2019. Bees of Europe. Hymenoptera of Europe, Vol. 1. N.A.P., Paris.

Potts S.G., Bartomeus I., Biesmeijer K., Bosch J., Breeze T., Kleijn D., Michez D., Oteman B., Quaranta M., Schweiger O. & Vujic A. 2025. EU Pollinator Monitoring Scheme: a science-policy co-design process – a reply to Krahner et al. Journal of Pollination Ecology 38 (14): 186–190. https://doi.org/10.26786/1920-7603(2025)871

Rasmont P., Devalez J., Pauly A., Michez D. & Radchenko V. 2017. Addition to the checklist of IUCN European wild bees (Hymenoptera: Apoidea). Annales de la Société entomologique de France (n.s.) 53 (1): 17–32. https://doi.org/10.1080/00379271.2017.1307696

Reverté S., Miličić M., Ačanski J., Andrić A., Aracil A., Aubert M., Balzan M.V., Bartomeus I., Bogusch P., Bosch J., Budrys E., Cantú-Salazar L., Castro S., Cornalba M., Demeter I., Devalez J., Dorchin A., Eric Dufrêne, Đorđević A.,…& Vujić A. 2023. National records of 3000 European bee and hoverfly species: A contribution to pollinator conservation. Insect Conservation and Diversity 16 (6): 758–775. https://doi.org/10.1111/icad.12680

Risch S. 1997. Die Arten der Gattung Eucera SCOPOLI 1770 (Hymenoptera, Apidae). Die Untergattung Pteneucera TKALCÜ 1984. Linzer biologische Beiträge 29 (1): 555–580. Available from https://www.zobodat.at/pdf/LBB_0029_1_0555-0580.pdf [accessed 24 Oct. 2025].

Risch S. 1999. Neue und wenig bekannte Arten der Gattung Eucera SCOPOLI 1770 (Hymenoptera, Apidae). Linzer biologische Beiträge 31 (1): 115–145.

Risch S. 2001. Die Arten des Genus Eucera SCOPOLI 1770 (Hymenoptera, Apidae) Untergattung Pareucera TKALCU 1979. Entomofauna 22 (15): 365–376.

Risch S. 2003. Die Arten der Gattung Eucera Scopoli 1770 (Hymenoptera, Apidae). Die Untergattungen Stilbeucera Tkalců 1979, Atopeucera Tkalců 1984, und Hemieucera Sitdikov and Pesenko 1988. Linzer biologische Beiträge 35: 1241–1292.

Scarpulla E.J. 2018. Four submarginal cells on a forewing of Melitoma taurea (Say) (Hymenoptera: Apidae), and a summary of known records of atypical and variable numbers of submarginal cells. Insecta Mundi 667: 1–28. Available from http://digitalcommons.unl.edu/insectamundi/1187 [accessed 24 Oct. 2025].

Scheuchl E. 2000. Illustrierte Bestimmungstabellen der Wildbienen Deutschlands und Österreichs. Band I: Anthophoridae, 2nd Ed. Erwin Scheuchl, Velden.

Schwarz M., Gusenleitner F.J., Westrich P. & Dathe H.H. 1996. Katalog der Bienen Österreichs, Deutschlands und der Schweiz (Hymenoptera, Apidae). Entomofauna Supplement 8: 1–398.

Sitdikov A.A. & Pesenko Y.A. 1988. The subgeneric classification of bees of the genus Eucera Scopoli (Hymenoptera, Anthophoridae), with a scheme of the phylogenetic relationships between the subgenera. Trudy Zooogicheskogo Instituta Akademii Nauk SSSR 175: 75–101. [In Russian.]

Tkalců B. 1979. Revision der europäischen Vertreter der Artengruppe von Tetralonia ruficornis (FABRICIUS) (Hymenoptera, Apoidea). Câsopis Moravského Musea 64: 127–152.

Tkalců B. 1984. Systematisches Verzeichnis der westpaläarktischen Tetralonia und Eucera Arten, deren Männchen als Blütenbesucher verschiedener Ophrys-Arten festgestellt wurden. Mit Beschreibung neuer Taxa (Hymenoptera: Apoidea). Nova Acta Regiae Societatis Scientiarum Upsaliensis (series V:C) 3: 57–77.

Published
2026-09-15
How to Cite
Dorchin, A., Rigaut, B., & Michez, D. (2026). Key to long horn bee species of the tribe Eucerini (Hymenoptera, Apoidea, Apidae) occurring in Europe. European Journal of Taxonomy, 1092(1), 1–70. https://doi.org/10.5852/ejt.2026.1092.3323
Section
Monograph