Urobatis halleri. As its common name implies, this ray’s smooth body or disc is nearly round. It does not have a dorsal fin. Its sturdy tail is less than half the length of its body and ends in a true caudal fin, unlike the thin whip-like tails of other stingrays that usually lack a caudal fin. The eyes and spiracles are on top of the head and the mouth, nostrils, and gill slits are on the ventral side. The sting is located on top of the tail about half way back from the base of the tail. An average sized ray usually has a spine that is 2.5-3.8 cm (1-1.5 in) in length. Round rays vary in color from tan to brown to gray and from plain to spotted or mottled with varying pattern shades giving them a dappled appearance. The dappling is diffuse in most round rays, but in some, the patterns are well defined. The underside is a solid whitish or light yellow color.
