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Heavily built and characteristically smooth, the pectoral fin disc of the short-tail stingray had a rather angular, rhomboid shape and was slightly wider than long. The leading margins of the disc were very gently convex, and converged on a blunt, broadly triangular snout. The eyes were small and immediately followed by much larger spiracles. The widely spaced nostrils were long and narrow between them was a short, skirt-shaped curtain of skin with a fringed posterior margin. The modestly sized mouth had an evenly arched lower jaw, prominent grooves at the corners, and five to seven papillae (nipple-like structures) on the floor. Additional, tiny papillae were scattered on the nasal curtain and outside the lower jaw. The teeth were arranged with a quincunx pattern into flattened surfaces each tooth was small and blunt, with a roughly diamond-shaped base. About 45–55 tooth rows were in either jaw. The pelvic fins were somewhat large and rounded at the tips. The tail was usually shorter than the disc and bore one, sometimes two, serrated stinging spines on the upper surface, about halfway along its length. It was broad and flattened until the base of the sting after, it tapered rapidly and a prominent ventral fin fold ran almost to the sting tip, as well as a low dorsal ridge. Dermal denticles were only found on the tail, with at least one thorn appearing on the tail base by a disc width of 45 cm (18 in). Adults had a midline row of large, backward-pointing, s...
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