Eels (Anguilliformes)

This group gathers Fish subcategory members belonging to the order Anguilliformes, the true eels, instantly recognizable by an elongated, snake-like body, the absence of pelvic fins, and a single continuous fin running along most of the back, around the tail and along the underside. It spans the freshwater eels of the genus Anguilla, including the European eel, which like several salmon species undertakes a long migration, though in the opposite direction, spending most of its life in fresh water before returning to the sea to spawn, and the morays, powerful reef-dwelling predators recognized by a second, pharyngeal set of jaws that can be projected forward into the mouth to help seize and swallow prey, an adaptation unique among vertebrates.