longiuscula, Rhamdella Lucena [C. A. S. de] & da Silva [J. F. P.] 1991:31, Figs. 2-3 [Comunicações do Museu de Ciências da PUCRS, Série Zoologia v. 4 (no. 3); ref. 19520] Arroio Passo do Alto, near Mineral, São Nicolau, about 28°08'S, 55°20'W, Rio Grande do Sul, Brazil. Holotype: MCP 14441. Paratypes: CFA-IC 11353 [ex ILPLA 1353, MCP 11211] (29); MCP 10883 (22), 11211 (72, now 70), 12623 (16), 12722 (79); MHNG 2516.57 (2); MZUSP 42487 (2); ?MLP 10522 [ex INPLA 1353] (1). Type catalog: Ferraris 2007:196 [ref. 29155], Miquelarena & Nadalin 2014:16 [ref. 33466], Bogan et al. 2019:24 [ref. 37088]. •Valid as Rhamdella longiuscula Lucena & da Silva 1991 -- (Burgess & Finley 1996:166 [ref. 22901], 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. 2014:42 [ref. 33590], Litz & Koerber 2014:21 [ref. 33622], Bertaco et al. 2016:417 [ref. 34561], Nión et al. 2016:33 [ref. 35565] as longiscauda, Koerber et al. 2017:5 [ref. 35083], Koerber et al. 2017:5 [ref. 35632], Koerber et al. 2019:6 [ref. 36736], Mirande & Koerber 2020:2 [ref. 37594], Loureiro et al. 2023:130 [ref. 40506]). Current status: Valid as Rhamdella longiuscula Lucena & da Silva 1991. Heptapteridae: Rhamdiinae. Distribution: South America: Uruguay River basin (Brazil, Uruguay and Argentina). Habitat: freshwater.