Rhathymus acutiventris Friese, 1906:120, ♀.Chiriqui (America centr.) (Mus. Budapest); Engel et al., 2004Engel, M.S., C.D. Michener & M.G. Rightmyer 2004. The cleptoparasitic bee tribe Rhathymini (Hymenoptera: Apidae): Description of a new genus and a tribal review. Journal of Hymenoptera Research 13 (1):1-12.:7, Holotype, examined (Budapest). - As Nanorhathymus acutiventris: - Engel et al., 2004Engel, M.S., C.D. Michener & M.G. Rightmyer 2004. A replacement name for the cleptoparasitic bee genus Rhathymodes (Hymenoptera: Apidae). Journal of Hymenoptera Research 13 (2):316.:316 (comb. nov.); Ayala et al., 2019Ayala, R., I.A. Hinojosa-Díaz & A.G. Armas-Quiñonez 2019. A new species of Rhathymus Lepeletier & Serville, 1828 (Hymenoptera: Apidae: Rhathymini) from Guatemala. Zootaxa 4700 (1):132-138. (distribution). - As Rathymus acutiventris: - Friese, 1912Friese, H. 1912. Neue und wenig bekannte Bienenarten der neotropischen Region. Archiv für Naturgeschichte 78 (6):198-226. (distribution). - As Rathymus acutiventris: - Friese, 1912Friese, H. 1912. Neue und wenig bekannte Bienenarten der neotropischen Region. Archiv für Naturgeschichte 78 (6):198-226. (distribution). - As Rhathymodes acuteiventris: - Starr & Hook, 2003Starr, C.K. & Hook, A.W. 2003. The aculeate Hymenoptera of Trinidad, West Indies. Occasional Papers o the Department of Life Sciences, University of the West Indies 12:1-31. (distribution). - As Rhathymodes acuteiventris: - Starr & Hook, 2003Starr, C.K. & Hook, A.W. 2003. The aculeate Hymenoptera of Trinidad, West Indies. Occasional Papers o the Department of Life Sciences, University of the West Indies 12:1-31. (distribution). - As Rhathymodes acutiventris: - Engel et al., 2004Engel, M.S., C.D. Michener & M.G. Rightmyer 2004. The cleptoparasitic bee tribe Rhathymini (Hymenoptera: Apidae): Description of a new genus and a tribal review. Journal of Hymenoptera Research 13 (1):1-12. (distribution), 7 (comb. nov.); Nava-Bolaños & Osorio-Olvera, 2022Nava-Bolaños, A. & L. Osorio-Olvera 2022. Estado del arte del conocimiento de biodiversidad de los polinizadores de México. Revista Mexicana de Biodiversidad 93:1-77. (distribution).
Rhathymus Friesei Ducke, 1907:458, ♂. Holotype ♂, Barbacena, Dezember 1905 (leg. Ducke), Lectotype ♂, Brazil, Estado de Minas Ger., Barbacena, 14.12.1905,examined (Berlin, leg. Ducke), designated by Engel et al., 2004Engel, M.S., C.D. Michener & M.G. Rightmyer 2004. The cleptoparasitic bee tribe Rhathymini (Hymenoptera: Apidae): Description of a new genus and a tribal review. Journal of Hymenoptera Research 13 (1):1-12.:7. Synonymized with Rhathymodes acutiventris (Friese, 1906) by Engel et al., 2004Engel, M.S., C.D. Michener & M.G. Rightmyer 2004. The cleptoparasitic bee tribe Rhathymini (Hymenoptera: Apidae): Description of a new genus and a tribal review. Journal of Hymenoptera Research 13 (1):1-12.:7.