Squatinactis montanus has the teeth, jaws and skull of a cladodont-toothed shark. Its body resembles that of the modern skates, rays, or angel sharks in being dorsoventrally flattened and having its pectoral fins greatly extended to the sides. S. montanus probably used the wing-like pectoral fins as well as the whip tail for propulsion. This body design has recurred several times in the fossil record for bottom-living lurking predators. They ranged in size to 2 feet.