dubius, Ancistrus cirrhosus var. Eigenmann [C. H.] & Eigenmann [R. S.] 1889:48 [Proceedings of the California Academy of Sciences (Series 2) v. 2; ref. 1253] Gurupa [Curupá], Para State, Brazil. Holotype: MCZ 7993. Paratypes: MCZ 7983 (5), 7984 (orig. 5, now 6), 7993 (1). Type catalog: Ferraris 2007:221 [ref. 29155]. •Valid as Ancistrus dubius Eigenmann & Eigenmann 1889 -- (Isbrücker 1980:68 [ref. 2303], Burgess 1989:437 [ref. 12860], Knaack 1999:152 [ref. 23874], Isbrücker 2001:25 [ref. 25653], Isbrücker 2002:12 [ref. 27178], Fisch-Muller in Reis et al. 2003:375 [ref. 27061], Ferraris 2007:221 [ref. 29155], Bifi et al. 2009:41 [ref. 30541], Sarmiento et al. 2014:161, 191 [ref. 35004], de Oliveira et al. 2015:81 [ref. 33869] as cf. dubius, Koerber et al. 2017:60 [ref. 35267], Provenzano & Barriga-Salazar 2018:235 [ref. 36344], de Souza et al. 2019:62 [ref. 36504]). Current status: Valid as Ancistrus dubius Eigenmann & Eigenmann 1889. Loricariidae: Hypostominae. Distribution: Amazon River basin; middle Paraná and Paraguay River basins: Brazil, Bolivia, Paraguay and Peru. Habitat: freshwater.