paulinus, Otocinclus Regan [C. T.] 1908:799, Fig. 208 [Proceedings of the Zoological Society of London 1907 (pt 4); ref. 14333] Rio Piracicaba, São Paulo, Brazil. Holotype (unique): BMNH 1907.7.6.9. Type catalog: Ferraris 2007:249 [ref. 29155]. •Valid as Otocinclus paulinus Regan 1908 -- (Isbrücker 1980:84 [ref. 2303], Burgess 1989:439 [ref. 12860]). •In Microlepidogaster -- (Schaefer 1997:8 [ref. 23213]). •Valid as Hisonotus paulinus (Regan 1908) -- (Isbrücker 2001:28, 30 [ref. 25653], Aquino et al. 2001:8 [ref. 25673], Isbrücker 2002:18 [ref. 27178], Britski & Garavello 2003:593 [ref. 27131], Schaefer in Reis et al. 2003:323 [ref. 27061], López et al. 2003:43 [ref. 27366] as cf. paulinus, Menni 2004:79 [ref. 28131] as cf. paulinus, Almirón & Azpelicueta 2006:92 [ref. 28713], Azpelicueta & Almirón 2007:596 and Fig. 2 [ref. 29353], Britski & Garavello 2007:414 [ref. 29429], Ferraris 2007:249 [ref. 29155], Martins et al. 2014:7 [ref. 33617], Zawadzki et al. 2016:381 [ref. 34367]). Current status: Valid as Hisonotus paulinus (Regan 1908). Loricariidae: Hypoptopomatinae. Distribution: Tietê River basin, upper Paraná River basin, Brazil. Habitat: freshwater.