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Rat-tailed stingray is a former common name for this species. [6] Lisa Rosenberger's 2001 phylogenetic analysis, based on morphology, determined the diamond stingray and the bluntnose stingray (H. say) of the western Atlantic Ocean to be sister species, that likely diverged before or with the formation of the Isthmus of Panama (c. 3 Ma).
Potamotrygon leopoldi is part of a species complex of blackish river rays with contrasting pale spots found in the Tapajós, Xingu and Tocantins basins [3]. River stingrays are almost circular in shape, and range in size from Potamotrygon wallacei, which reaches 31 cm (1.0 ft) in disc width, [9] to the chupare stingray (S. schmardae), which grows up to 2 m (6.6 ft) in disc width. [10]
The thorntail stingray, black stingray, or longtail stingray (Dasyatis thetidis) is a species of stingray in the family Dasyatidae. It is found off southern Africa, Australia, and New Zealand from the intertidal zone to a depth of 440 m (1,440 ft). This bottom-dweller inhabits soft-bottomed habitats such as lagoons, estuaries, and reefs ...
The oldest known stingray taxon is "Dasyatis" speetonensis from the Hauterivian of England, whose teeth most closely resemble that of the extant sixgill stingray (Hexatrygon). Although stingray teeth are rare on sea bottoms compared to the similar shark teeth, scuba divers searching for the latter do encounter the teeth of stingrays. [6] [8]
The black-spotted whipray (Maculabatis astra) is a species of stingray in the family Dasyatidae, found in the coastal waters off southern New Guinea and northern Australia. Long thought to be a variant of the related brown whipray (H. toshi), this species has an angular, diamond-shaped pectoral fin disc and a whip-like tail without fin folds ...
A group opposed to affirmative action filed a lawsuit accusing McDonald's of not going far enough when it recently rolled back several diversity initiatives by continuing to maintain a program ...
The ocellate river stingray (Potamotrygon motoro), also known as the peacock-eye stingray or black river stingray, is a species of freshwater stingray in the family Potamotrygonidae. It was the first species to be described in the family and is also the most widespread, ranging throughout much of the Río de la Plata , Amazon , Mearim and ...
The Xingu River ray, River stingray, white-blotched river stingray, or polka-dot stingray (Potamotrygon leopoldi) is a species of freshwater fish in the family Potamotrygonidae. It is endemic to the Xingu River basin in Brazil and as such prefers clear waters with rocky bottoms. [ 1 ]