fluviatilis, Plecostomus Schubart [O.] 1964:7, Figs. 1-4 [Boletim do Museu Nacional do Rio de Janeiro, Zoologia, Nova Série No. 251; ref. 3425] Rio Mogi Guaçu basin, Brazil. Syntypes: (6) EEBP 282 (1, ex 3, 2 lost), 658 (2, lost); MRNJ uncat. (1). Type catalog: Ferraris 2007:253 [ref. 29155], Azevedo-Santos et al. 2023:547 [ref. 40344]. •Valid as Hypostomus fluviatilis (Schubart 1964) -- (Isbrücker 1980:23 [ref. 2303], Burgess 1989:431 [ref. 12860], Isbrücker 2001:28, 31 [ref. 25653], Isbrücker 2002:18 [ref. 27178], Weber in Reis et al. 2003:357 [ref. 27061], Armbruster 2004:79 [ref. 27644], Ferraris 2007:253 [ref. 29155], Cardoso et al. 2012:77 [ref. 32154], Zawadzki et al. 2019:[11] [ref. 37170]). Current status: Valid as Hypostomus fluviatilis (Schubart 1964). Loricariidae: Hypostominae. Distribution: South America: Rio Grande basin (Brazil). Habitat: freshwater.