asopos, Mastiglanis Bockmann [F. A.] 1994:762, Fig. 1 [Proceedings of the Biological Society of Washington v. 107 (no. 4); ref. 21608] Igarapé Saracazinho, tributary of Rio Trombetas, near Porto Trombetas, Pará State, Brazil. Holotype: MNRJ 12227. Paratypes: MNRJ 12228-29 (10, 1, c&s); MZUSP 7446 (2), 23299 (2), 23533 (1), 23541 (10), 23549 (1), 23875 (1), 24282 (2), 25635 (1), 30617-18 (84, 11), 30633 (2), 30635-36 (1, 2), 34953-55 (6, 17, 6), 44215 (1, c&s); UFRJ 381-382 (2, 1). Type catalog: Ferraris 2007:187 [ref. 29155]. •Valid as Mastiglanis asopos Bockmann 1994 -- (Burgess & Finley 1996:166 [ref. 22901], Bockmann & Guazzelli in Reis et al. 2003:415 [ref. 27061], Ferraris 2007:187 [ref. 29155], DoNascimiento et al. 2017:91 [ref. 35633], de Pinna & Keith 2019:126 [ref. 36797], Faustino-Fuster & Ortega 2020:331 [ref. 37683], Gales et al. 2022:330 [ref. 39007], Koerber et al. 2022:60 [ref. 39235], Taphorn et al. 2022:48 [ref. 41297]). Current status: Valid as Mastiglanis asopos Bockmann 1994. Heptapteridae: Heptapterinae. Distribution: South America: lower Amazon, Capim, Orinoco and Cuyuni River basins (Brazil, Colombia, Guyana and Venezuela). Habitat: freshwater.