Congroidei

The Colocongridae, the worm eels or short-tail eels, are a family of eels, containing a single genus, Coloconger.

Congroidei is a suborder of ray-finned fishes belonging to the order Anguilliformes, the eels. These eels are mostly marine, although a few species of snake eel will enter freshwater, and they are found in tropical and temperate waters throughout the world.