Patchwork Stingaree

Among the largest members of its family, the patchwork stingaree can grow to at least 59 cm (23 in) long. It has a diamond-shaped pectoral fin disc much wider than long, with broadly rounded outer corners and nearly straight anterior margins that converge at an obtuse angle. The tip of the snout protrudes slightly past the disc. The small eyes are followed by comma-shaped spiracles with angular posterior rims. The outer rim of each nostril may be enlarged into a small knob; between the nostrils is a skirt-shaped curtain of skin with a finely fringed trailing margin. There are 8–14 stubby papillae (nipple-like structures) on the floor of the large mouth, as well as a narrow patch of large papillae on the lower jaw. The teeth are small with roughly oval bases, and the five pairs of gill slits are short. The pelvic fins are small with curved margins. The short, very flattened tail measures 67–79% as long as the disc and terminates in a short, deep, leaf-shaped caudal fin. A lateral skin fold runs along the each side of the tail, which is most obvious in juveniles. The upper surface of the tail bears a rather large dorsal fin followed by a serrated stinging spine. The skin entirely lacks dermal denticles. …

The patchwork stingaree is a northern Australian endemic with a discontinuous range: the western population is found from the Houtman Abrolhos to Cape Leveque in Western Australia, and the eastern population from Caloundra to Townsville in Queensland. It seems to be rather patchily distributed, with only small numbers of individuals present at any particular location. This benthic species is mostly found over fine substrates on the outer continental shelf, and has been reported from 60 to 320 m (200 to 1,050 ft) deep.

Virtually nothing is known of the natural history of the patchwork stingaree. Ecologically, it is apparently the tropical equivalent of the temperate sandyback stingaree. Reproduction is presumably aplacental viviparous like in other stingrays, with the developing embryos sustained by maternally produced histotroph ("uterine milk"). The litter size is probably small, judging by related species. Males mature sexually at under 38 cm (15 in) long.