Cyprinodontiformes - Definition and Overview

Cyprinodontiformes
Mummichog (Fundulus heteroclitus heteroclitus)
Scientific classification
Kingdom: Animalia Phylum: Chordata Class: Actinopterygii Order: Cyprinodontiformes
Families
Anablepidae (four-eyed fish) Cyprinodontidae (pupfish) Fundulidae Goodeidae Rivulinidae Poeciliidae (live-bearers) (and others)

The Cyprinodontiformes is an order of ray-finned fish, also called the Microcyprini, and comprising mostly small, fresh-water fish. They are closely related to the Atheriniformes and are occasionally included with them. Many popular aquarium fish, such as killifish and live-bearers, belong here.