Coral Sea Stingaree

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. …

Endemic to northern Queensland, the range of the Coral Sea stingaree extends from Moreton Island northward to Cairns, and encompasses the Saumarez and Marion Reefs. This bottom-dwelling species is found on the outer continental shelf and upper continental slope, at a depth of 171–370 m (561–1,214 ft).

Virtually nothing is known of the natural history of the Coral Sea stingaree. It is presumably aplacental viviparous like other stingrays, with developing embryos provisioned with maternally produced histotroph ("uterine milk"). Newborns measure around 12 cm (4.7 in) long; the litter size is probably small based on related species. Males and females attain sexual maturity at under 23 cm (9.1 in) and 27 cm (11 in) long respectively. The disparity between the maturation size and the maximum size is usually large for a cartilaginous fish, and it is possible that the specimens currently identified as the Coral Sea stingaree actually represent distinct species, one large and one small. However, the presumed large and small forms cannot be distinguished by morphological or meristic traits.