Nurse sharks have two spineless, rounded dorsal fins, with the first dorsal fin being much larger than the second, and they have one anal fin. The first dorsal fin is located over the pelvic fins. The caudal fin is more than one quarter of the total shark's length. The sub-terminal mouth is placed well in front of the eyes, the spiracles are small, and there are long barbels on the mouth. The Nurse shark has nasoral grooves, but there is no perinasal groove.