Osmia ashmeadii (Titus, 1904)
Taxonomy & Nomenclature
Conservation Status
Data Deficient (OBIC, 2025:36; NatureServe, 2026) or Missing (OBIC, 2019:36)
Last record: 1995? (NatureServe, 2026)
Listed as GH (Possibly Extinct) by (OBIC, 2019:36), but more recent assessments consider the species to be data deficient (Oregon Biodiversity Information Center, 2025:36; NatureServe, 2026).
Distribution & Habitat
The Dalles, Wasco County, Oregon, USA
Anatomy & Morphology
Biology & Ecology
Hypodigm
Media
References
Cane, J. H., Griswold, T. L. and Parker, F. D. (2007). Substrates and Materials Used for Nesting by North American Osmia Bees (Hymenoptera: Apiformes: Megachilidae). Annals of the Entomological Society of America 100(3): 350-358.
Hurd, P. D., Jr. (1979). Superfamily Apoidea. In K.V. Krombein: Catalog of Hymenoptera in America north of Mexico 2: 1741-2209. Washington D.C.
NatureServe. (2026). Osmia ashmeadii. NatureServe Network Biodiversity Location Data accessed through NatureServe Explorer [web application]. NatureServe, Arlington, Virginia. Available at: https://explorer.natureserve.org/ [Accessed on 18 August 2026]
OBIC (Oregon Biodiversity Information Center). (2019). Rare, Threatened and Endangered Species of Oregon. Institute for Natural Resources, Portland State University, Portland, Oregon. 133 pp.
OBIC (Oregon Biodiversity Information Center). (2025). Rare, Threatened and Endangered Zoology Species of Oregon. Institute for Natural Resources, Portland State University, Portland, Oregon. 44 pp.
Rightmyer, M. G., Griswold, T. L. and Brady, S. G. (2013). Phylogeny and systematics of the bee genus Osmia (Hymenoptera: Megachilidae) with emphasis on North American Melanosmia: subgenera, synonymies and nesting biology revisited. Systematic Entomology 38(3): 561-576.
Shepherd, M. D. (2005). Species Profile: Osmia ashmeadii. In Shepherd, M. D., D. M. Vaughan, and S. H. Black (Eds). Red List of Pollinator Insects of North America. CD-ROM Version 1 (May 2005). Portland, OR: The Xerces Society for Invertebrate Conservation.
Tepedino, V. J., and Griswold, T. L. (1995). The bees of the Columbia Basin. Final report, USDA Forest Service, Portland, OR. 212 pp.
White, J. R. (1952). A revision of the genus Osmia, subgenus Acanthosmioides. University of Kansas Science Bulletin 35: 219-307.