Lasioglossum villosulum

Murao, Ryuki, 2017, Bees of the Hemihalictus series of Lasioglossum Curtis (Hymenoptera, Halictidae) in South Korea, Zootaxa 4268 (4), pp. 451-488 : 463

The villosulum group

Diagnosis. This group may be separated from the other Palearctic groups by a combination of the following character states: the distal process of female labrum flat except for keel, with small projection laterally; male labrum with distinct distal process; male antenna short, not reaching metasoma; and the ventral retrorse lobe of male genitalia broad, with weak or distinct lineolation on inner surface.