Potamotrygon rex Carvalho, 2016
Great freshwater stingray
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Family:  Potamotrygonidae (River stingrays), subfamily: Potamotrygoninae
Max. size:  75 cm WD (male/unsexed)
Environment:  benthopelagic; freshwater
Distribution:  South America: Rio Tocantins, Brazil.
Biology:  Reported stomach contents in this species include fishes, insects and insect larvae, mollusks, and crustaceans, with predominance of insect larvae. Ontogenetic dietary shifts occur in species of this genus. Sexual maturity for males at about 58.0 cm TL (37.5 cm DL, 35.6 cm DW, MZUSP 120369, claspers almost fully calcified). Specimens greater than 100 cm in TL can easily weigh 20 kg. Great disparity in the largest sizes achieved by males and females (Ref. 115938).
IUCN Red List Status: Not Evaluated (N.E.) Ref. (124695)
Threat to humans:  harmless
Country info:   

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