nigricans, Trichomycterus Valenciennes [A.] 1832:348 [Voyage de Humboldt et Bonpland v. 2 (Title page 1833); ref. 4503] Rio de Janeiro, Brazil. Holotype: ? MNHN B-0251. Type catalog: Ferraris 2007:421 [ref. 29155]. Unneeded replacement for Eremophilus mulisii Humboldt 1805; in prevailing usage as a different genus and species. Genus misspelled Thrychomycterus in Cuvier & Valenciennes 1846:485 (but spelled correctly on p. 494 [ref. 1011]). •Valid as Trichomycterus nigricans Valenciennes 1832 -- (Burgess 1989:322 [ref. 12860], Bizerril 1994:623 [ref. 22673], Arratia 1998:349 [ref. 23661], de Pinna & Wosiacki in Reis et al. 2003:283 [ref. 27061], Bockmann et al. 2004:227 [ref. 27855], Maldonado-Ocampo & Albert 2004:5 [ref. 27978], Lima & Costa 2004:3 [ref. 27979], Ferraris 2007:421 [ref. 29155], García-Melo et al. 2016:237 [ref. 34471], Costa et al. 2020:2911 [ref. 37529], Reis et al. 2020:7 [ref. 37862], Costa et al. 2020:81 [ref. 38088], Vilardo et al. 2023:5 [ref. 40643]). Current status: Valid as Trichomycterus nigricans Valenciennes 1832. Trichomycteridae: Trichomycterinae. Distribution: South America: Rio Macacu basin (Rio de Janeiro State, Brazil). Habitat: freshwater.