immaculatum, Pygidium Eigenmann [C. H.] & Eigenmann [R. S.] 1889:52 [Proceedings of the California Academy of Sciences (Series 2) v. 2; ref. 1253] Rio São Matheos, Rio Doce basin, Espírito Santo, Brazil. Lectotype: MCZ 8302. Paralectotypes: MCZ 8266 (1), 8300 (10), 8305 (1), 8307 (1) and more. Type catalog: Ferraris 2007:419 [ref. 29155]. Lectotype selected by Reis & de Pinna 2022:60 [ref. 39360]. •Valid as Trichomycterus immaculatum [sometimes as immaculatus] (Eigenmann & Eigenmann 1889) -- (Burgess 1989:322 [ref. 12860], Bizerril 1994:623 [ref. 22673], de Pinna & Wosiacki in Reis et al. 2003:282 [ref. 27061]). •Synonym of Trichomycterus travassosi (Miranda Ribeiro 1949) -- (Bizerril 1994:623 [ref. 22673], Bockmann et al. 2004:227 [ref. 27855], Maldonado-Ocampo & Albert 2004:5 [ref. 27978], Lima & Costa 2004:3 [ref. 27979]). •Valid as Trichomycterus immaculatus (Eigenmann & Eigenmann 1889) -- (Ferraris 2007:419 [ref. 29155], Barbosa & Costa 2010:121 [ref. 30782], Fernández et al. 2015:11 [ref. 35041] as inmaculatus, García-Melo et al. 2016:237 [ref. 34471], Costa et al. 2020:2916 [ref. 37529], Donin et al. 2020:16 [ref. 37395], Reis et al. 2020:7 [ref. 37862], Costa et al. 2020:81 [ref. 38088], Reis & de Pinna 2022:55 [ref. 39360], Vilardo et al. 2023:5 [ref. 40643]). Current status: Valid as Trichomycterus immaculatus (Eigenmann & Eigenmann 1889). Trichomycteridae: Trichomycterinae. Distribution: South America: Rio Doce and adjacent basins (Minas Gerais and Rio de Janeiro, Brazil). Habitat: freshwater.