Rhina ancylostoma, also known as the bowmouth guitarfish, is a member of the order of Rajiformes, being related to skates and rays. It is the only member of the genus Rhina. Widely distributed in the Indo-Pacific and West Pacific from East Africa, Red Sea to South Africa, Arabian Sea to Papua New Guinea, north to Japan, across northern Australia from Exmouth Gulf in Western Australia to New South Wales.
It is a large fish, growing up to 3 meter long and weighing up to 140 kilograms. The snout is round, and a spiny medialridge runs down the body with lesser lateral ridges and thorns over the eyes, on the back and shoulders. The jaws have undulating ridges of crushing teeth. It is white underneath and grey or brown above with many white spots on the body, fins and tail and black spots on the head. It is ovoviviparous. It does not have the distinctive ocelli of the giant guitarfish.