eriarcha, Rhamdia Eigenmann [C. H.] & Eigenmann [R. S.] 1888:129 [Proceedings of the California Academy of Sciences (Series 2) v. 1 (pt 2); ref. 1249] Rio Grande do Sul, Brazil. Holotype (unique): MCZ 27272. Type catalog: Ferraris 2007:196 [ref. 29155]. •Valid as Rhamdella eriarcha (Eigenmann & Eigenmann 1888) -- (Malabarba 1989:143 [ref. 14217], Burgess 1989:278 [ref. 12860], Langeani 1990:37 [ref. 16736], Lucena & da Silva 1991:39 [ref. 19520], Miquelarena & Menni 1999:207 [ref. 24223], Bockmann & Guazzelli in Reis et al. 2003:422 [ref. 27061], Ferraris 2007:196 [ref. 29155], Bockmann & Miquelarena 2008:46 [ref. 29643], Reis et al. 2014:41 [ref. 33590], Bertaco et al. 2016:417 [ref. 34561], Giora & Wingert 2023:95 [ref. 41026], Loureiro et al. 2023:130 [ref. 40506]). Current status: Valid as Rhamdella eriarcha (Eigenmann & Eigenmann 1888). Heptapteridae: Rhamdiinae. Distribution: South America: Laguna dos Patos system (Brazil and Uruguay). Habitat: freshwater.