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The bizarre Lessiniabatis of Early Eocene Italy. Permineralized stingray teeth have been found in sedimentary deposits around the world as far back as the Early Cretaceous.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).
The common stingray has a plain coloration and mostly smooth skin. The common stingray has been reported to reach a width of 1.4 m (4.6 ft) and a length of 2.5 m (8.2 ft), though a width of 45 cm (18 in) is more typical. [8] The flattened pectoral fin disc is diamond-shaped and slightly wider than it is long, with narrowly rounded outer corners ...
One of the smallest stingray species, the Atlantic stingray attains a maximum length of 61 cm (24 in) and a weight of 4.9 kg (11 lb). [4] It has a spade-shaped pectoral fin disk 1.1 times as wide as long, with rounded corners and concave anterior margins. The snout is relatively long.
The southern stingray (Hypanus americanus) is a whiptail stingray found in tropical and subtropical waters of the Western Atlantic Ocean from New Jersey to southern Brazil. [2] It has a flat, diamond-shaped disc, with a mud brown, olive, and grey dorsal surface and white underbelly (ventral surface). [ 3 ]
The mouth is wide and curved, with faint furrows at the corners. There is a row of seven papillae on the floor, with the outermost pair smaller and set apart from the others. [ 8 ] There are 37–46 tooth rows in the upper jaw and 39–45 tooth rows in the lower jaw. [ 9 ]
Stingray stings nearly all occur on an individual’s feet and lower legs. Although such an injury is painful, it is not considered to be life-threatening. However, if a sting were to occur in the ...
The mouth is small with two central papillae and a row of enlarged, long-cusped teeth halfway along the upper jaw on both sides. The nasal curtain, formed by the merging of the nasal flaps, is long and narrow.
The mouth is relatively small, with a deep concavity at the center of the lower jaw and shallow furrows at the corners extending onto the lower jaw. [13] A row of 4–5 papillae (nipple-like structures) is found across the floor of the mouth. There are 26–40 upper tooth rows and 27–44 lower tooth rows. [14] The pelvic fins are small and ...