Potamotrygon amandae Loboda, Carvalho, 2013,

Ota, Renata Rúbia, Deprá, Gabriel de Carvalho, Graça, Weferson Júnio da & Pavanelli, Carla Simone, 2018, Peixes da planície de inundação do alto rio Paraná e áreas adjacentes: revised, annotated and updated, Neotropical Ichthyology 16 (2), pp. 1-111: 15-16

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http://doi.org/ 10.1590/1982-0224-20170094



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Potamotrygon amandae Loboda, Carvalho, 2013


Potamotrygon amandae Loboda, Carvalho, 2013 

Fig. 2View Fig

Body depressed; disc length contained 0.8 to 1.2 times in disc width (DW); distance from mouth to cloaca 1.3 to 1.7, distance from cloaca to caudal sting 1.8 to 2.6, tail length 0.8 to 1.0, and caudal sting length 3.1 to 9.3 in DW; mouth width 7.6 to 14.3, tail width 7.2 to 16.4 in DW; tail length 1.4 in disc length (DL); horizontal orbital diameter 1.0 to 5.3 in least interorbital width. Mouth inferior; upper jaw with 18-39 teeth and lower jaw with 20-39 teeth. Pectoral fin with 92-103 rays; mid-dorsal spines 11-70 ( Loboda, Carvalho, 2013). Dorsal disc coloration variable, from brown-olive to dark-grey, with bicolor ocelli distributed throughout entire disc ( Loboda, Carvalho, 2013).

Maximum disc length. 341.0 mm.

Distribution. Paraná-Paraguay system.

Remarks. Potamotrygon amandae  was identified as P. cf. motoro  by Graça, Pavanelli (2007). Loboda, Carvalho (2013) revised the P. motoro  species complex from the Paraguay-Paraná basin and assigned all specimens from the rio Paraná, upstream from the Itaipu dam, to P. amandae  (which otherwise was found only in the Pantanal region). Additionally, the same authors recorded P. motoro  from the rio Guaporé, upper rio Paraguai basin and lower reaches of the rio Paraná in Argentina. On the other hand, the only other Potamotrygon  species found in the upper rio Paraná floodplain is P. cf. falkneri  that, as P. amandae  , is a nonnative species in the region. Both occurrences are associated with the filling of the Itaipu Reservoir and the consequent inundation of the Sete Quedas Falls ( Langeani et al., 2007; Júlio Júnior et al., 2009; Loboda, Carvalho, 2013).