hystrix, Trygon Müller [J.] & Henle [F. G. J.] 1841:167 [Systematische Beschreibung der Plagiostomen; ref. 3069] Buenos Aires, Argentina. Lectotype: MNHN A-2449. Paralectotypes: (5) MNHN A-2433 (1), ?A-2434 (2), A-8706 (lost); RMNH 4258 (1). Type catalog: Bertin 1939:88-89 [ref. 20739], Séret & McEachran 1987:21 [ref. 9312]. Species dates to an earlier published Plate as histrix. Lectotype selected by Castex 1969:8 [ref. 9548]. See Carvalho 2001:1168 [ref. 26256]. •Objective synonym of Potamotrygon histrix (Müller & Henle 1839) -- (Carvalho et al. in Reis et al. 2003:24 [ref. 27061]). Current status: Synonym of Potamotrygon histrix (Müller & Henle 1839). Potamotrygonidae: Potamotrygoninae. Habitat: freshwater.