schuhmacheri, Potamotrygon Castex [M. N.] 1964:92, 94, Fig. [Neotrópica (La Plata) v. 10 (no. 32); ref. 20916] Río Colastiné Sur, Santa Fe, Argentina. MFA 269. Spelled schühmacheri on p. 94 and in Castex 1964:32-33 [ref. 20924] and authorship given as "Castex, Martínez Achenbach" in Castex 1964:32 [ref. 20924], but Castex is the only author. •Status questionable -- (Carvalho et al. 2011:2 [ref. 31264]). •Valid as Potamotrygon schuhmacheri Castex 1964 -- (Castex 1964:32 [ref. 20924], Compagno 1999:495 [ref. 25589], Carvalho et al. in Reis et al. 2003:25 [ref. 27061], López et al. 2003:7 [ref. 27366], Menni 2004:70 [ref. 28131], Mirande & Koerber 2015:8 [ref. 35117], Weigmann 2016:157 [ref. 34211] see remarks, Carvalho et al. 2016:581 [ref. 34422], Carvalho 2016:6 [ref. 34730], Carvalho 2016:647 [ref. 34997], Koerber et al. 2017:11 [ref. 35267]). Current status: Valid as Potamotrygon schuhmacheri Castex 1964. Potamotrygonidae: Potamotrygoninae. Distribution: Paraná-Paraguay River basin, South America. Habitat: freshwater.