Rajiformes

Rajiformes: Gill openings ventral; anterior edge of the greatly enlarged pectoral fin attached to side of head, anterior to the gill openings; anal fin absent; eyes and spiracles on dorsal surface; anterior vertebrae fused to form a synarcual; suprascapulae of pectoral girdles joined dorsally over vertebral column and articulating with column of synarcual or fused with synarcual; nictitating membrane absent, cornea attached directly to skin around the eyes; body generally strongly depressed; jaws protrusible in most; teeth pavementlike; in most, water for breathing taken in chiefly through the spiracle rather than the mouth (except for those living off the bottom); most give birth to live young (some have eggs encased in a horny capsule); the snout may function as an electroreceptive organ (as may be true for all elasmobranchs).
 * See Fishbase

Families in this order:
 * Anacanthobatidae
 * Dasyatidae
 * Gymnuridae
 * Hexatrygonidae
 * Myliobatidae
 * Plesiobatidae
 * Potamotrygonidae
 * Rajidae
 * Rhinobatidae
 * Urolophidae
 * Urotrygonidae