unicolor, Plecostomus Steindachner [F.] 1908:164 [Anzeiger der Kaiserlichen Akademie der Wissenschaften, Wien, Mathematisch-Naturwissenschaftliche Klasse v. 45 (no. 11) (for 2 Apr. 1908); ref. 18806] Rio Purus, Brazil. Lectotype: NMW 44271:2. Paralectotypes: NMW 44271:1 (1) and :3 (1), 44272 (1). Type catalog: Ferraris 2007:225 [ref. 29155]. Lectotype selected by Armbruster 1998:254 [ref. 23319]. •Valid as Hypostomus unicolor (Steindachner 1908) -- (Isbrücker 1980:36 [ref. 2303], Burgess 1989:432 [ref. 12860], Armbruster 2004:80 [ref. 27644]). •Valid as Aphanotorulus unicolor (Steindachner 1908) -- (Armbruster 1998:254 [ref. 23319], Isbrücker 2001:25, 31 [ref. 25653], Isbrücker 2002:12 [ref. 27178], Weber in Reis et al. 2003:351 [ref. 27061], Ferraris 2007:225 [ref. 29155], Barriga Salazar 2014:112 [ref. 35745], Sarmiento et al. 2014:191 [ref. 35004], Ray & Armbruster 2016:524 [ref. 34178], DoNascimiento et al. 2017:82 [ref. 35633], Oliveira et al. 2017:[7] [ref. 35225], Meza-Vargas et al. 2021:25 [ref. 39298]). Current status: Valid as Aphanotorulus unicolor (Steindachner 1908). Loricariidae: Hypostominae. Distribution: South America: upper Amazon River basin (Bolivia, Brazil, Colombia, Ecuador and Peru). Habitat: freshwater.