Anthidiellum (Loyolanthidium) boreale ( Robertson, 1902 ) Portman & Gardner & Lane & Gerjets & Petersen & Ascher & Arduser & Evans & Boyd & Thomson & Cariveau, 2023

Portman, Zachary M., Gardner, Joel, Lane, Ian G., Gerjets, Nicole, Petersen, Jessica D., Ascher, John S., Arduser, Mike, Evans, Elaine C., Boyd, Crystal, Thomson, Robin & Cariveau, Daniel P., 2023, A checklist of the bees (Hymenoptera: Apoidea) of Minnesota, Zootaxa 5304 (1), pp. 1-95 : 63

Anthidiellum (Loyolanthidium) boreale ( Robertson, 1902) stat. nov.

Dianthidium boreale Robertson 1902: 232 ♁. Holotype: ♁ USA, Illinois, Carlinville [INHS]. Images of holotype examined.

Counties: Yellow Medicine.

Material examined: Yellow Medicine Co.: Stony Run (44.875, -95.647): 1 ♀ ( MNDNR), 13 Jul 2022, N. Gerjets leg., handnet, Amorpha canescens , determined by M. Arduser.

Comments: Originally described as a species by Robertson (1902), Anthidiellum boreale (Robertson) has generally been treated as a subspecies of Anthidiellum notatum (Latreille) ( Schwarz 1926; Mitchell 1962; Hurd 1979; Gibbs et al. 2017). Anthidiellum notatum historically had five subspecies ( A. n. boreale , A. n. gilense , A. n. notatum , A. n. robertsoni , and A. n. rufimaculatum), but Urban (2001) raised two of them— A. gilense (Cockerell) and A. robertsoni (Cockerell) —to species status. Urban (2001) did not formally treat A. boreale or A. rufimaculatum Schwarz, but they did refer to them as species when noting that no specimens had been examined. In addition, A. boreale has long been recognized as morphologically distinct ( Mitchell 1962, Gibbs et al. 2017), and the male genitalia are also distinct from A. notatum notatum (M. Arduser, unpublished). As a result, we are formally raising A. boreale to a full species. An additional issue is that there is a primary homonym, Anthidiellum borealis Wu, 2004 , which we assign a new name in the “Additional Nomenclatural Change’’ section below.

The exact range of A. boreale is unclear, but it has been previously reported from Illinois ( Robertson 1902), Michigan ( Gibbs et al. 2017), and Nebraska ( Swenk 1914). We have further recorded it from Indiana, Kansas, Missouri, and Wisconsin (M. Arduser, unpublished).

Genus Anthidium Fabricius

Taxonomy: Miller et al. (2002); Gonzalez & Griswold (2013).

Subgenus Anthidium Fabricius s. str.