Lasioglossum petrellum is a species of sweat bee in the family Halictidae.Sharkey M.J. (2007). Phylogeny and Classification of Hymenoptera."Phylogenetic relationships among superfamilies of Hymenoptera", Sharkey M.J., Carpenter J.M., Vilhelmsen L., et al. 2012. Cladistics 28(1): 80-112.
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