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Smithsonian Institution, National Museum of Natural History, Department of Entomology   cc-by-nc-sa-3.0

Mesonychium is a genus of Hymenoptera in the family Apidae.

EOL has data for one attribute:

Known occurrences, collected specimens and observations of Mesonychium Lepeletier & Audinet-Serville 1825. View this species on GBIF