Ceratina (Zadontomerus) dupla Say 1837

Gibbs, Jason, Ascher, John S., Rightmyer, Molly G. & Isaacs, Rufus, 2017, The bees of Michigan (Hymenoptera: Apoidea: Anthophila), with notes on distribution, taxonomy, pollination, and natural history, Zootaxa 4352 (1), pp. 1-160 : 66

Ceratina (Zadontomerus) dupla Say 1837

County records: Allegan, Barry, Bay, Berrien, Calhoun, Cass, Clinton, Eaton, Huron, Ingham, Jackson, Kalamazoo, Lake, Lapeer, Leelanau, Lenawee, Livingston, Mecosta, Newaygo, Ottawa, Saginaw, Van Buren, Washtenaw.

Notes. Daly (1973) revised the Ceratina of America north of Mexico, which included examination of Michigan material. Due to problems with female identification, no doubt confounded by the presence of the then unknown C. mikmaqi Rehan & Sheffield, only males were identified in Daly’s revision. Specimens identified as C. dupla at MSUC were reexamined by JG. Of the 104 males identified by Daly as C. dupla only 12 were in fact that species. The remaining specimens were C. mikmaqi . Although most historical records of Ceratina dupla were misidentified, the species as currently definied is confirmed for 20 counties in the Lower Peninsula (see checklist entry below).

Nesting in Ontario described by Vickruck et al. (2011).