signatus, Potamotrygon Garman [S.] 1913:420 [Memoirs of the Museum of Comparative Zoology v. 36; ref. 1545] Rio Puty, tributary of Rio Parnahyba [Rio Parnaíba]; Parnahyba [Rio Parnaíba] at San Gonçalo, Rio de Janeiro, Brazil. Syntypes: MCZ 560-S (1), 600-S (1); USNM 153589 [ex MCZ 560-S] (1). Type catalog: Hartel & Dingerkus 1997:xliv [ref. 23119]. See Carvalho 2001:1168 [ref. 26256]. Castex 1964:26 [ref. 20924] said four syntypes at MCZ. •Valid as Potamotrygon signata Garman 1913 -- (Castex 1964:26 [ref. 20924] as signatus, Hartel & Dingerkus 1997:xix [ref. 23119], Compagno 1999:495 [ref. 25589], Carvalho et al. in Reis et al. 2003:25 [ref. 27061], Carvalho et al. 2011:26 [ref. 31264], Fontenelle et al. 2014:341 [ref. 33180], Ramos et al. 2014:3 [ref. 35321], Weigmann 2016:157 [ref. 34211], Carvalho et al. 2016:582 [ref. 34422], Carvalho 2016:6 [ref. 34730], Reis et al. 2016:17 [ref. 34496], Carvalho 2016:649 [ref. 34997]). Current status: Valid as Potamotrygon signata Garman 1913. Potamotrygonidae: Potamotrygoninae. Distribution: South America: Rio Parnaíba basin (Brazil). Habitat: freshwater.