Devilfish (Rajiformes) is flattened cartilaginous fish distinguished by a generally flattened body and grately enlarged pectoral fins that reach as far forward as the sides of the head what makes the body look even wider. They have the shape of a leaf or a diamon shaped plate which is why they are often popularly called sea leaves. They swim in wavy movements produced by pectoral fins. However, most of the time they are burried in the sediment as they are poorly mobile. Its tail is extremely narrow and whip like at most types with dorsal fin laid all the way back.

Upper body is darker and adapted to the color of the environment while underside has no pigment what makes it very fair. The eyes and spiracles are placed on the upper back side whereas the gill slits, nasal flap and mouth are under the head. Certain types on their back or tail have a protective poissonous thorn. Other types have an electrical organ that can cause pretty strong electric shock if under attack.