Andrena (Ulandrena) resoluta Warncke, 1973

Andrena resoluta is part of the A. concinna -group of species in the subgenus Ulandrena, and was described as a subspecies of A. concinna by Warncke (who considered all members of this group to be subspecies of A. concinna). These “subspecies” were treated as good species by subsequent authors, but the difference between A. resoluta (southern Balkans) and A. crecca Warncke, 1965 (broadly Turkey) was unclear. The differences between the two (including geographical range) are extremely small, and A. resoluta was synonymised with A. crecca, which is the senior synonym according to Wood (2024).