retropinnatus, Horiomyzon Stewart [D. J.] 1986:48, Figs. 1-2 [Proceedings of the Academy of Natural Sciences of Philadelphia v. 138; ref. 5777] Río Napo at Añangu, Napo Province, Ecuador, 0°31.6'S, 76°22.9'W. Holotype (unique): FMNH 96553. Type catalog: Ferraris 2007:185 [ref. 29155]. •Valid as Horiomyzon retropinnatus Stewart 1986 -- (Burgess & Finley 1996:167 [ref. 22901], Bockmann & Guazzelli in Reis et al. 2003:413 [ref. 27061], Ferraris 2007:185 [ref. 29155], Barriga Salazar 2014:114 [ref. 35745]). Current status: Valid as Horiomyzon retropinnatus Stewart 1986. Heptapteridae: Heptapterinae. Distribution: Amazon and Napo River basins: Brazil and Ecuador. Habitat: freshwater.