Potamotrygon cf. falkneri Castex, Maciel, 1963

Fig. 2

Body depressed; disc length contained 1.0 to 1.1 times in disc width (DW); distance from mouth to cloaca 1.4 to 1.6, distance from cloaca to caudal sting 1.7 to 2.1, tail length 1.0, and caudal sting length 4.2 to 6.0 in DW; mouth width 9.9 to 12.9, tail width 7.6 to 9.8 in DW; tail length 1.0 in disc length (DL); horizontal orbital diameter 2.3 to 3.9 in least interorbital width. Mouth inferior; upper jaw with 22-50 teeth and lower jaw with 26 to 44 teeth. Pectoral fin with 95-99 rays; mid-dorsal spines 18-56 (Rosa, 1985). Dorsal disc coloration brown, with numerous oval-shaped to reniform, yellow (occasionally black-margined) ocelli, usually wider than eye diameter (Graça, Pavanelli, 2007).

Maximum disc length. 780.0 mm (Graça, Pavanelli, 2007).

Distribution. Paraná-Paraguay system.

Remark. Potamotrygon cf. falkneri is a non-native species in the upper rio Paraná and its occurrence can be associated with the filling of the Itaipu Reservoir and the consequent inundation of the Sete Quedas Falls.