Andrena (Melandrena) cyanura Cockerell (Hymenoptera: Apoidea, Andrenidae), a valid North American species

Cory S Sheffield


Andrena (Melandrena) transnigra Viereck, 1904, a species originally described from Seattle, is a large, distinctive, and rather common solitary bee that is active in the spring and early summer in western North America. Consideration of morphological variation within females of this species across its range, particularly scopal hair, with subsequent genetic analysis led to the discovery of two distinct DNA barcodes attributed to this species; the 6.6% divergence between the sequences was consistent with the distinctive morphology. As a result, A. cyanura Cockerell, 1916 is here removed from synonymy with A. transnigra and resurrected as a valid species. In addition, A. transnigra paysoni Cockerell, 1924 is also removed from synonymy with A. transnigra and is instead treated as a new synonym of A. cyanura. The male of A. cyanura was previously described as A. transnigra by Bouseman and LaBerge (1979), so a diagnosis is provided to distinguish the two species; thus, the male of A. transnigra is treated for the first time. Both sexes of A. cyanura are distinguished from A. transnigra and other similar Melandrena Pérez, 1890. In addition to the morphological and genetic differences between A. transnigra and A. cyanura, each also has a distinctive geography in Canada, albeit overlapping in parts of British Columbia. Andrena transnigra is seemingly restricted to the southern half of British Columbia, while A. cyanura is more widespread, ranging from southern British Columbia, north to the Yukon and as far east as Saskatchewan. The limited molecular data available for these species the United States also supports their status is distinct species, though re-examination of specimens in collections will help to clarify their respective distributions in North America.


Bees; morphology; DNA barcode; geography; resurrected taxon; synonym

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Ascher J.S., and Pickering, J. 2020. Discover Life bee species guide and world checklist (Hymenoptera: Apoidea: Anthophila) [online]. Available from [accessed 27 January 2020]

Bouseman, J.K, and LaBerge, W.E. 1979. A revision of the bees of the genus Andrena of the Western Hemisphere. Part IX. Subgenus Melandrena. Transactions of the American Entomological Society, 104(3/4): 275–389. Available from

Cockerell, T.D.A. 1916. Some Rocky Mountain andrenid bees. The Canadian Entomologist, 48(7): 252–254.

Cockerell, T.D.A. 1924 A bee collecting trip to Chimney Rock, Wyoming. Entomological News, 35: 347–351.

Cockerell, T.D.A. 1931. Rocky Mountain Bees. II. American Museum Novitates, 458: 1–20.

Dubitzky, A., Plant, J., and Schönitzer, K. 2010. Phylogeny of the bee genus Andrena Fabricius based on morphology (Hymenoptera: Andrenidae). Mitteilungen der Münchner Entomologischen Gesellschaft, 100: 137–202.

Gardner, K.E., and Ascher, J.S. 2006. Notes on the native bee pollinators in New York apple orchards. Entomologica Americana, 114(1): 86–91.[86:NOTNBP]2.0.CO;2 (29 June 2020) GBIF Occurrence Download

Gibbs, J. 2018. DNA barcoding a nightmare taxon: assessing barcode index numbers and barcode gaps for sweat bees. Genome, 61: 21–31.

Gusenleitner, F., and Schwarz, M. 2002. Weltweite Checkliste der Bienengattung Andrena mit Bemerkungen und Ergänzungen zu Paläarktischen Arten. Entomofauna, Suppl. 12: 1–1280.

Lanham, U.N. 1949. Notes on the group of Andrena carlini Cockerell, with descriptions of a new species from California (Hymenoptera: Apoidea). The Pan-Pacific Entomologist, 25(1): 33–35.

Park, M.G., Raguso, R.A., Losey, J.E., and Danforth, B.N. 2016. Per-visit pollinator performance and regional importance of wild Bombus and Andrena (Melandrena) compared to the managed honey bee in New York apple orchards. Apidologie, 47: 145–160.

Ratnasingham, S., and Hebert, P.D.N. 2007. BOLD: The Barcode of Life Data System (http:// Molecular Ecology Notes, 7(3): 355–364.

Ratnasingham, S., and Hebert, P.D.N. 2013. A DNA-based registry for all animal species: the barcode index number (BIN) system. PLoS ONE, 8(7): e66213. PMID:23861743

Rehan, S.M., and Sheffield, C.S. 2011. Morphological and molecular delineation of a new species in the Ceratina dupla species-group (Hymenoptera: Apidae: Xylocopinae) of eastern North America. Zootaxa, 2873: 35–50.

Sheffield, C.S. 2020. A new species of Andrena (Trachandrena) from the Southwestern United States (Hymenoptera, Andrenidae). Journal of Hymenoptera Research, 77: 87–103.

Sheffield, C.S., and Heron, J.M. 2018. The bees of British Columbia (Hymenoptera: Apoidea, Apiformes). Journal of the Entomological Society of British Columbia, 115: 44–85.

Sheffield, C.S., Kevan, P.G., Smith, R.F., Rigby, S.M., and Rogers, R.E.L. 2003. Bee species of Nova Scotia, Canada, with new records and notes on bionomics and floral relations (Hymenoptera: Apoidea). Journal of the Kansas Entomological Society, 76: 357–384.

Sheffield, C.S., Frier, S.D., and Dumesh, S. 2014. The bees (Hymenoptera: Apoidea, Apiformes) of the Prairies Ecozone, with comparisons to other grasslands of Canada. In Arthropods of Canadian Grasslands (Volume 4): Biodiversity and Systematics Part 2. Edited by D.J. Giberson and H.A. Cárcamo. Biological Survey of Canada. pp. 427–467.

Sheffield, C.S., Heron, J., Gibbs, J., Onuferko, T.M., Oram, R., Best, L., deSilva, N., Dumesh, S., Pindar, A., and Rowe, G. 2017. Contribution of DNA barcoding to the study of the bees (Hymenoptera: Apoidea) of Canada: progress to date. The Canadian Entomologist, 149(6): 736–754.

Shorthouse, D.P. 2010. SimpleMappr, an online tool to produce publication-quality point maps. Available from [accessed 30 June 2020].

Viereck, H.L., Cockerell, T.D.A., Titus, E.S.G., Crawford, J.C., and Swenk, M.H. 1904a. Synopsis of bees of Oregon, Washington, British Columbia and Vancouver. ̶ III. The Canadian Entomologist, 36(7): 189–196.

Viereck, H.L., Cockerell, T.D.A., Titus, E.S.G., Crawford, J.C., and Swenk, M.H. 1904b. Synopsis of bees of Oregon, Washington, British Columbia and Vancouver. ̶ III. The Canadian Entomologist, 36(8): 221–232.


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