Potamotrygon Garman [S.] 1877:210 Fem. Pastenagus humboldtii Roulin 1829. Type by subsequent designation. Type given as hystrix as designated by Jordan 1919:389 [ref. 4904] by Séret & McEachran 1987:6 [ref. 9312]; Garman treated histrix as a synonym of humboldtii. Eigenmann 1910 says type is humboldtii Roulin. •Valid as Potamotrygon Garman 1877 -- (Castex 1964:18 [ref. 20924], Rosa et al. 1987:447 [ref. 5974], Nishida 1990:98 [ref. 19783], Britski et al. 1999:21 [ref. 24147], Compagno 1999:495 [ref. 25589], Carvalho et al. in Reis et al. 2003:23 [ref. 27061] with type as histrix, Deynat 2006:484 [ref. 28948], Rosa et al. 2008:1 [ref. 29564], Oddone et al. 2008:69 [ref. 29661],/ Carvalho & Lovejoy 2011:45 [ref. 31182], Carvalho et al. 2011:1 [ref. 31264], Carvalho & Ragno 2011:135 [ref. 31309], Silva & Carvalho 2011:140 [ref. 31310], Ng et al. 2011:2385 [ref. 31474], Oddone et al. 2012:299 [ref. 31835], Frederico et al. 2012:72 [ref. 31909], Kottelat 2013:28 [ref. 32989], Loboda & Carvalho 2013:693 [ref. 33024], Fontenelle et al. 2014:249 [ref. 33180], Silva & Carvalho 2015:5 [ref. 33871], Carvalho et al. 2016:566 [ref. 34422], Carvalho 2016:537 [ref. 34666], Carvalho 2016:5 [ref. 34730], Bertaco et al. 2016:411 [ref. 34561], Carvalho et al. 2016:203 [ref. 34827], Carvalho 2016:620 [ref. 34997], Fontenelle & Carvalho 2017:1 [ref. 35537], Silva & Loboda 2019:1 [ref. 36727], Roberts 2021:93 [ref. 38077]). Current status: Valid as Potamotrygon Garman 1877. Potamotrygonidae: Potamotrygoninae.