nudiceps, Hypostomus Müller [J.] & Troschel [F. H.] 1849:631 [Reisen in Britisch-Guiana; ref. 3072] Takutu, Guyana. Holotype (unique): ZMB 3180. Type catalog: Ferraris 2007:223 [ref. 29155]. Fisch-Muller in Reis et al. 2003:377 [ref. 27061] treats ZMB 3180 as the holotype [needs checking]. •Valid as Ancistrus nudiceps (Müller & Troschel 1849) -- (Isbrücker 1980:71 [ref. 2303], Burgess 1989:437 [ref. 12860], Isbrücker 2001:25, 28 [ref. 25653], Isbrücker 2002:12 [ref. 27178], Fisch-Muller in Reis et al. 2003:377 [ref. 27061], Ferraris 2007:223 [ref. 29155], de Souza et al. 2019:35 [ref. 36504]). Current status: Valid as Ancistrus nudiceps (Müller & Troschel 1849). Loricariidae: Hypostominae. Distribution: Essequibo River system and tributaries of the Amazon River basin (Takutu River), Guyana, and Cuyuni River, Venezuela. Habitat: freshwater.