(subclass Actinopterygii, superorder Scopelomorpha)
An order of marine fish that have a slender body, single dorsal and often an adipose fin, and forked tail fin. Some families (e.g. the Synodontidae) are found in coastal waters. Others (e.g. the Myctophidae and Evermanellidae) are typical deep-sea fish.
Subjects: Zoology and Animal Sciences.