Halictus insignis Smith, 1853:65 - As Megommation insigne: - Smith-Pardo, 2003Smith-Pardo, A.H. 2003. A preliminary account of the bees of Colombia (Hymenoptera: Apoidea): present knowledge and future directions. Journal of the Kansas Entomological Society 76 (2):335-341. (distribution); Imperatriz-Fonseca et al., 2011Imperatriz-Fonseca, V.L., I. Alves-dos-Santos, P. Souza Santos-Filho, W. Engels, M. Ramalho, W. Wilms, J.B Vicentin Aguilar, C.A. Pinheiro-Machado, D. Araújo Alves & A. Matos Peixoto Kleinert 2011. Checklist of bees and honey plants from São Paulo State, Brazil. Biota Neotropica 11 (1a):631-655. (distribution).
Halictus cherazon Vachal, 1904:113, Rasmussen, 2012Rasmussen, C. 2012. Joseph Vachal (1838–1911): French entomologist and politician. Zootaxa 3442:1-52.:22, Holotype ♀ (MNHN). - Engel & Brooks, 1998Engel, M.S. & R.W. Brooks 1998. The nocturnal bee genus Megaloptidia (Hymenoptera: Halictidae). Journal of Hymenoptera Research 7 (1):1-14.:13 ( listed as synonym of Megommation insigne (Smith, 1853)); Rasmussen, 2012Rasmussen, C. 2012. Joseph Vachal (1838–1911): French entomologist and politician. Zootaxa 3442:1-52.:22 ( listed as synonym of Megommation insigne (Smith, 1853)).
Megalopta virgili Friese, 1911:454 - Engel & Brooks, 1998Engel, M.S. & R.W. Brooks 1998. The nocturnal bee genus Megaloptidia (Hymenoptera: Halictidae). Journal of Hymenoptera Research 7 (1):1-14.:13 ( listed as synonym of Megommation insigne (Smith, 1853)).
Megalopta ipomoeae Schrottky, 1912:271 - Engel & Brooks, 1998Engel, M.S. & R.W. Brooks 1998. The nocturnal bee genus Megaloptidia (Hymenoptera: Halictidae). Journal of Hymenoptera Research 7 (1):1-14.:13 ( listed as synonym of Megommation insigne (Smith, 1853)).
Megalopta pallitarsis Friese, 1926:125, ♂. 2 ♂, Espirito Santo, Piauhy, S.-Brasil, Februar. Synonymized with Megommation insigne (Smith, 1853) by Engel & Brooks, 1998Engel, M.S. & R.W. Brooks 1998. The nocturnal bee genus Megaloptidia (Hymenoptera: Halictidae). Journal of Hymenoptera Research 7 (1):1-14.:13. - As Megalopta pallitarsus: - As Megaloptidia pallitarsus: