Cyprinodontiformes

The Cyprinodontiformes is an order of ray-finned fish, comprising mostly small, fresh-water fish. Many popular aquarium fish, such as killifish and live-bearers, are included. They are closely related to the Atheriniformes and are occasionally included with them. A colloquial term for the order as a whole is toothcarps, though they are not actually close relatives of the true carps. The families of Cyprinodontiformes can be divided into three groups: viviparous and ovoviviparous (all species give live birth), and oviparous (all species egg-laying). For more information, visit the Wikipedia entry Get back to Actinopterygii
Desert pupfish	Devils Hole pupfish	Guppy