Short-Tail Stingray

Heavily built and characteristically smooth, the pectoral fin disc of the short-tail stingray has a rather angular, rhomboid shape and is slightly wider than long. The leading margins of the disc are very gently convex, and converge on a blunt, broadly triangular snout. The eyes are small and immediately followed by much larger spiracles. The widely spaced nostrils are long and narrow; between them is a short, skirt-shaped curtain of skin with a fringed posterior margin. The modestly sized mouth has an evenly arched lower jaw, prominent grooves at the corners, and five to seven papillae (nipple-like structures) on the floor. Additional, tiny papillae are scattered on the nasal curtain and outside the lower jaw. Short-tailed stingrays have between 45–55 densely arranged teeth, which are small, blunt, and conical.

The short-tail stingray is common and widely distributed in the temperate waters of the Southern Hemisphere. Off southern Africa, it has been reported from Cape Town in South Africa to the mouth of the Zambezi River in Mozambique. Along the southern Australian coast, it is found from Shark Bay in Western Australia to Maroochydore in Queensland, including Tasmania. In New Zealand waters, it occurs off North Island and the Chatham Islands, and rarely off South Island and the Kermadec Islands. Records from northern Australia and Thailand likely represent misidentifications of pink whipray and pitted stingray, respectively. Over the past few decades, its range and numbers off southeastern Tasmania have grown, possibly as a result of climate change.

The short-tail stingray is usually slow-moving, but can achieve sudden bursts of speed, flapping its pectoral fins with enough force to cavitate the water and create an audible "bang". Cavitation is when a liquid is pushed faster that it can react, causing a drop in pressure. It is known to form large seasonal aggregations; a well-known example occurs every summer (January to April) at the Poor Knights Islands off New Zealand, particularly under the rocky archways. In some areas, it moves with the rising tide into very shallow water. Individual rays tend to stay inside a relatively small home range with a radius of under 25 km (16 mi). Captive experiments have shown it capable of detecting magnetic fields via its electroreceptive ampullae of Lorenzini, which in nature may be employed for navigation.

Curious and unaggressive, the short-tail stingray may approach humans and can be trained to be hand-fed. At Hamelin Bay in Western Australia, many short-tail stingrays, thorntail stingrays, and New Zealand eagle rays regularly gather to be hand-fed fish scraps; the number of visitors has steadily increased in recent years, and interest exists in developing the site as a permanent tourist attraction. However, if startled or harassed, this species is capable of inflicting a serious, even fatal wound with its sting. The sting can measure over 30 cm (12 in) long and can penetrate most types of footwear, including kevlar bootees, and its mucous sheath contains a toxin that causes necrosis. The most dangerous injuries involve damage to a vital organ, massive blood loss, and/or secondary sepsis or tetanus. A startled ray is also able to leap through water, and inflict injuries with its tail.