biseriatus, Plecostomus Cope [E. D.] 1872:285, Pl. 16 (figs. 1-2) [Proceedings of the Academy of Natural Sciences of Philadelphia v. 23; ref. 921] Amazon River, Peru or Brazil. Holotype (unique): ANSP 8279. Type catalog: Böhlke 1984:121 [ref. 13621], Ferraris 2007:297 [ref. 29155]. •Valid as Hypostomus biseriatus (Cope 1872) -- (Isbrücker 1980:20 [ref. 2303], Burgess 1989:430 [ref. 12860], Armbruster 2004:79 [ref. 27644]). •Valid as Squaliforma biseriata (Cope 1872) -- (Isbrücker et al. 2001:22 [ref. 25649], Isbrücker 2001:31, 32 [ref. 25653], Isbrücker 2002:29 [ref. 27178], Weber in Reis et al. 2003:367 [ref. 27061], Ferraris 2007:297 [ref. 29155]). •Synonym of Aphanotorulus horridus (Kner 1854) -- (Ray & Armbruster 2016:519 [ref. 34178]). Current status: Synonym of Aphanotorulus horridus (Kner 1854). Loricariidae: Hypostominae. Habitat: freshwater.