; subclass Actinopterygii, order Myctophiformes)
A fairly large family of marine, mid-water fish that have slender, streamlined bodies, pointed heads, and a single dorsal fin located half-way along the back. They are fairly common deep-sea fish, with few species exceeding 32 cm in length. There are about 50 species, distributed world-wide.
Subjects: Zoology and Animal Sciences.