Description
The Coral Sea stingaree has a diamond-shaped pectoral fin disc 113–121% wider than long, with nearly straight leading margins and rounded outer corners. The tip of the fleshy, triangular snout protrudes past the disc. The eyes are rather large, and are followed by teardrop-shaped spiracles with rounded to angular posterior rims. There is a skirt-shaped flap of skin between the nostrils, with a weakly fringed posterior margin whose corners are extended into small lobes. The medium is of medium size and contains 7–9 papillae (nipple-like structures) on the floor; the 5–7 papillae in the middle may have multiple tips. The lower jaw also bears a patch of minute papillae. The teeth number 32–35 rows in the upper jaw and 30–39 in the lower jaw, and are small with roughly rhomboid bases. The five pairs of gill slits are short. The pelvic fins are small and rounded posteriorly; males have blunt claspers.
The tail measures 76–85% as long as the disc and is flattened at the base; there may be a subtle skin fold running along each side. A serrated stinging spine is placed atop the tail about halfway along its length, with a low dorsal fin just in front. The tail ends in a short, deep, leaf-shaped caudal fin. The skin is devoid of dermal denticles. Rays found in the Coral Sea are generally light gray or brown above with tiny dark dots, while those off Queensland tend to be darker brown above and unpatterned. The dorsal and caudal fins are brown with blackish margins. Juveniles are usually more densely spotted than adults, and have a dark stripe along the dorsal midline of the tail. The underside is white, sometimes with dusky lateral disc margins and/or a few dark blotches on the tail. The largest known specimen is 48 cm (19 in) long.
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