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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 marbled stingray has a thin, oval-shaped pectoral fin disc longer than wide. The snout is long and triangular, with the pointed tip projecting from the disc. The eyes are small, and immediately followed by spiracles over twice their diameter. There is a curtain of skin between the nares with a fringed trailing margin.
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 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]
Potamotrygon is a genus of freshwater stingrays in the family Potamotrygonidae native to the rivers of South America, [1] and sometimes seen in the aquarium trade. [2] It inhabits rivers of tropical and subtropical climates, especially those of the Amazon basin and is virtually present in all South American countries, except for Chile.
In July 1964, Schwinn announced the arrival of the Super Deluxe Sting-Ray. This model included a front spring-fork, a new sleeker Sting-Ray banana seat, and a Person's Hi-loop Sissy bar. The Super Deluxe also gave the rider a choice of White wall tires or the new Yellow oval rear Slik tire paired with a front black wall Westwind tire.
French naturalist Charles Alexandre Lesueur originally described the bluntnose stingray from specimens collected in Little Egg Harbor off the U.S. State of New Jersey.He published his account in an 1819 volume of the Journal of the Academy of Natural Sciences of Philadelphia, and named the new species Raja say in honor of Thomas Say, one of the founding members of the Academy.
The short-tail stingray or smooth stingray (Bathytoshia brevicaudata) is a common species of stingray in the family Dasyatidae. It occurs off southern Africa , typically offshore at a depth of 180–480 m (590–1,570 ft), and off southern Australia and New Zealand , from the intertidal zone to a depth of 156 m (512 ft).
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