guianensis, Ageneiosus Eigenmann [C. H.] 1912:204, Pl. 21 (fig. 2) [Memoirs of the Carnegie Museum v. 5 (no. 1); ref. 1227] Wismar, Guyana. Holotype (unique): FMNH 53247 [ex CM 1712]. Type catalog: Henn 1928:74 [ref. 12305], Ibarra & Stewart 1987:6 [ref. 12367], Ferraris 2007:70 [ref. 29155]. •Valid as Ageneiosus guianensis Eigenmann 1912 -- (Burgess 1989:286 [ref. 12860]). •Synonym of Ageneiosus ucayalensis Castelnau 1855 -- (Ferraris in Reis et al. 2003:472 [ref. 27061] with question, Ferraris 2007:70 [ref. 29155] with question, Mirande & Koerber 2015:30 [ref. 35117]). •Synonym of Ageneiosus dentatus Kner 1858 -- (Ribeiro et al. 2017:18 [ref. 35133]). Current status: Synonym of Ageneiosus dentatus Kner 1858. Auchenipteridae: Auchenipterinae. Habitat: freshwater.