brevis, Chaetostomus Regan [C. T.] 1904:247, Pl. 13 (fig. 3) [Transactions of the Zoological Society of London v. 17 (pt 3, no. 1); ref. 3621] Eastern Ecuador. Syntypes: (6) BMNH 1898.11.4.33-36 (4), MSNM 40 [ex MSNM 5592] (1) Rio Zamora; MZUT 1488-89 (total 15 specimens, 1 evidently is a syntype). Type catalog: Tortonese 1940:137 [ref. 21559], Conci & Michelangeli 1974:226 [ref. 21560] Ferraris 2007:228 [ref. 29155]. Original genus is correctly Chaetostoma. •Valid as Chaetostoma brevis Regan 1904 -- (Ovchynnyk 1967:39 [ref. 37559]). •Valid as Chaetostoma breve Regan 1904 -- (Isbrücker 1980:60 [ref. 2303], Ortega & Vari 1986:17 [ref. 9708], Burgess 1989:435 [ref. 12860], Isbrücker 2001:26 [ref. 25653], Isbrücker 2002:13 [ref. 27178], Fisch-Muller in Reis et al. 2003:379 [ref. 27061], Salcedo 2006:62 [ref. 28542], Ferraris 2007:228 [ref. 29155], Ballen 2011:388 [ref. 31653], Barriga Salazar 2014:113 [ref. 35745], Lujan et al. 2015:685 [ref. 33975], Urbano-Bonilla & Ballen 2021:12 [ref. 38058], Meza-Vargas et al. 2022:376 [ref. 39368]). Current status: Valid as Chaetostoma breve Regan 1904. Loricariidae: Hypostominae. Distribution: South America: Marañón River drainage, upper Amazon basin, Ecuador and Colombia. Habitat: freshwater.