The Cyprinodontiformes reference article from the English Wikipedia on 24-Jul-2004
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Cyprinodontiformes

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Cyprinodontiformes
Mummichog
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.