Coelho, B. W. T., & Engel, M. S. (2018). A new group of species within the bee genus Ruizantheda, with a revised key to the males of the genus (Hymenoptera: Halictidae: Caenohalictini). Zootaxa, 4415(3), 513–532. https://doi.org/10.11646/zootaxa.4415.3.6