Lasioglossum (Dialictus) oceanicum ( Cockerell 1916 )

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 : 84

Lasioglossum (Dialictus) oceanicum ( Cockerell 1916)

County records: Allegan, Antrim, Barry, Berrien, Branch, Calhoun, Cass, Clare, Clinton, Eaton, Gladwin, Gratiot, Huron, Ingham, Ionia, Iosco, Jackson, Kalamazoo, Kalkaska, Kent, Lapeer, Leelanau, Livingston, Manistee, Mecosta, Midland, Montcalm, Muskegon, Newaygo, Oakland, Oceana, Osceola, Ottawa, Saginaw, Sanilac, St. Joseph, Tuscola, Van Buren, Wexford.

Notes. There has been some confusion over the name of this bee. Halictus nymphaearum was proposed as a replacement for the preoccupied Halictus palustris Robertson (1890) (not Halictus palustris Morawitz 1876 ), and subsequently the species has most often been referred to as Dialictus nymphaearum (Robertson 1895) or as L. (D.) nymphaearum (Robertson 1895) . Gibbs (2010b) resurrected the name L. oceanicum ( Cockerell 1916) from synonymy as the valid name for this species after discovering that the apparent lectotype of H. palustris Robertson , labeled as such and deposited at ANSP, pertained to another well-known species L. albipenne (Robertson 1890) rather than to Dialictus nymphaearum sensu auct. (e.g., Mitchell, 1960). Gibbs (2011) reversed this decision based on an inability to find a valid lectotype designation, but this was in fact validly published by Cresson (1928) showing the decision by Gibbs (2010) to have been correct (contra Gibbs 2011). Thus, Lasioglossum oceanicum is the correct name for this species, i.e. the names Halictus palustris Robertson and H. nymphaearum return to synonymy under L. albipenne .