Notacanthiformes
Notacanthiformes (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.
Heteromi
Heteromi A group of deep-sea fish that are now included in the order Notacanthiformes.
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