
The Cyprinodontiformes z are an order of ray-finned fish, comprising mostly small, freshwater 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 actua...
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http://en.wikipedia.org/wiki/Cyprinodontiformes

An order of fish with eight families and numerous species of both egg-laying and livebearing fish. It includes two suborders, adrianichthyoidei (egg layers) and cyprinodontoidei (egg layers and livebearers). The latter suborder comprises cyprinodontidae (egg-laying killifish), goodeidae (mexican livebearers), jenynsiidae (jenynsiids), anablepidae (...
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http://www.encyclo.co.uk/local/20973
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