Cyprinodontiformes

Anablepidae (four-eyed fish)
Cyprinodontidae (pupfish)
Fundulidae
Goodeidae
Rivulinidae
Poeciliidae (live-bearers)
(and others)

</table> 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.