Potamotrygon brachyura (Günther, 1880)
  • Common names: chucho de río (Uruguay), yavevih, yabebi, raya boba (Argentina and Paraguay)
  • Range: Northeastern Argentina, western Brazil, central Paraguay, western Uruguay
  • Adult size: 297-858 cm

Rosa, key to species (1985):

"Dorsal surface of disc without large ocelli; small circular spots or ocelli occasionally present above orbits or submarinally on disc.... Dorsal disc with regular reticulate pattern of dark lines delimiting polygonal figures.... Reticulate shapes relatively large, their maximum diameter nearly equal to interocular distance; disc circular; distnace from cloaca to insertion of caudal sting contained more than 2.7 times in disc width."

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