(subclass Actinopterygii, superorder Elopomorpha)
An order of deep-sea fish that have elongate, tapering bodies terminating in a very small tail fin. The pelvic fins are located on the abdomen slightly ahead of the origin of the dorsal fin. All species have a long anal fin and a ventrally positioned mouth. The order includes the spiny eels (Notacanthidae) and other deep-sea fish.
Subjects: Zoology and Animal Sciences.