malacops, Chaetostomus Cope [E. D.] 1872:287, Pl. 5 (figs. 2a-b) [Proceedings of the Academy of Natural Sciences of Philadelphia v. 23; ref. 921] Río Ambyiacu, Peru. Syntypes: ANSP 8299 (2, disintegrated). Type catalog: Böhlke 1984:123 [ref. 13621], Ferraris 2007:222 [ref. 29155]. Original genus is correctly Chaetostoma. •Valid as Ancistrus malacops (Cope 1872) -- (Isbrücker 1980:70 [ref. 2303], Ortega & Vari 1986:16 [ref. 9708], Burgess 1989:437 [ref. 12860], Isbrücker 2001:25, 26 [ref. 25653], Isbrücker 2002:12 [ref. 27178], Fisch-Muller in Reis et al. 2003:377 [ref. 27061], Ferraris 2007:222 [ref. 29155], Barriga Salazar 2014:113 [ref. 35745], Provenzano & Barriga-Salazar 2018:227 [ref. 36344], de Souza et al. 2019:61 [ref. 36504], Bifi et al. 2019:8 [ref. 36821], Meza-Vargas et al. 2021:25 [ref. 39298]). Current status: Valid as Ancistrus malacops (Cope 1872). Loricariidae: Hypostominae. Distribution: South America: upper Amazon River basin (Brazil, Colombia, Ecuador and Peru). Habitat: freshwater.