popoi, Plecostomus Pearson [N. E.] 1924:20, Pl. 3 (figs. 2-3) [Indiana University Studies v. 11 (no. 64); ref. 3396] Río Popoi, Upper Río Beni system, upper Amazon River basin, Bolivia. Holotype: CAS 77346 [ex IU 17010]. Paratypes: CAS 81231 [ex IU 17010] (orig. 3, now 2); UMMZ 66503 (1). Type catalog: Ferraris 2007:225 [ref. 29155]. •Valid as Hypostomus popoi (Pearson 1924) -- (Isbrücker 1980:32 [ref. 2303], Burgess 1989:432 [ref. 12860]). •Valid as Aphanotorulus popoi (Pearson 1924) -- (Armbruster & Page 1996:385 [ref. 22151], Burgess & Finley 1996:170 [ref. 22901], Isbrücker 2001:25, 31 [ref. 25653]). •Synonym of Hypostomus unicolor (Steindachner 1908) -- (Armbruster 2004:79 [ref. 27644]). •Synonym of Aphanotorulus unicolor (Steindachner 1908) -- (Armbruster 1998:254 [ref. 23319], Weber in Reis et al. 2003:352 [ref. 27061], Ferraris 2007:225 [ref. 29155], Ray & Armbruster 2016:525 [ref. 34178]). Current status: Synonym of Aphanotorulus unicolor (Steindachner 1908). Loricariidae: Hypostominae. Habitat: freshwater.