alternatum, Pygidium Eigenmann [C. H.] 1917:700 [Proceedings of the American Philosophical Society v. 56; ref. 1237] Rio Doce, near the village Rio Doce, Minas Gerais, Brazil [20°14'41"S, 42°53'45"W]. Holotype: FMNH 58082 [ex CM 7079]. Paratypes: CAS 64575 (4), FMNH 58083 (62). Type catalog: Henn 1928:79 [ref. 12305], Ibarra & Stewart 1987:72 [ref. 12367], Ferraris 2007:414 [ref. 29155]. •Valid as Trichomycterus alternatus (Eigenmann 1917) -- (Burgess 1989:321 [ref. 12860] as alternatum, Bizerril 1994:623 [ref. 22673], Miquelarena & Fernández 2000:44 [ref. 27633], de Pinna & Wosiacki in Reis et al. 2003:279 [ref. 27061], Wosiacki & Garavello 2004:5 [ref. 27649], Triques & Vono 2004:170 [ref. 27798], Bockmann et al. 2004:227 [ref. 27855], Alencar & Costa 2004:3 [ref. 27991], Ferraris 2007:414 [ref. 29155], Barbosa & Costa 2010:120 [ref. 30782], Barbosa & Costa 2011:308 [ref. 31672], Barbosa & Costa 2012:156 [ref. 32045], Barbosa 2013:274 [ref. 33106], García-Melo et al. 2016:238 [ref. 34471], Reis & de Pinna 2019:104 [ref. 36632], Donin et al. 2020:10 [ref. 37395], Reis & de Pinna 2022:14 [ref. 39360], Costa et al. 2022:513 [ref. 39820], Costa et al. 2023:12 [ref. 40511], Vilardo et al. 2023:5 [ref. 40643], Vieira-Guimarães et al. 2024:50 [ref. 41258]). Current status: Valid as Trichomycterus alternatus (Eigenmann 1917). Trichomycteridae: Trichomycterinae. Distribution: South America: Atlantic coastal river basins from Rio Doce to Rio Paranaguá, Minas Gerais (Brazil). Habitat: freshwater.