brachyurus, Trygon Günther [A.] 1880:8 [Annals and Magazine of Natural History (Series 5) v. 6 (no. 31) (art. 2); ref. 14279] Buenos Aires, Argentina. Holotype (unique): BMNH 1953.8.10.14 [ex BMNH 1879.2.12.4]. •Synonym of Elipesurus spinicauda Jardine & Schomburgk 1843 -- (Castex 1968:353 [ref. 26357]). •Valid as Potamotrygon brachyura (Günther 1880) -- (Castex 1964:24 [ref. 20924] as brachyurus, Britski et al. 1999:21 [ref. 24147], Compagno 1999:495 [ref. 25589], Carvalho et al. in Reis et al. 2003:23 [ref. 27061], López et al. 2003:6 [ref. 27366], Menni 2004:70 [ref. 28131], Oddone et al. 2008:69 [ref. 29661], Carvalho et al. 2011:26 [ref. 31264], Oddone et al. 2012:300 [ref. 31835], Litz & Koerber 2014:5 [ref. 33622], Mirande & Koerber 2015:8 [ref. 35117], Weigmann 2016:154 [ref. 34211], Carvalho 2016:562 [ref. 34666], Carvalho 2016:6 [ref. 34730], Bertaco et al. 2016:411 [ref. 34561], Carvalho 2016:630 [ref. 34997], Nión et al. 2016:23 [ref. 35565], Koerber et al. 2017:10 [ref. 35267], Loureiro et al. 2023:24 [ref. 40506]). Current status: Valid as Potamotrygon brachyura (Günther 1880). Potamotrygonidae: Potamotrygoninae. Distribution: South America: Paraná-Paraguay and Uruguay River basins (Argentina, Brazil, Paraguay and Uruguay). Habitat: freshwater.