Gambusia

Gambusia is a genus of fish in the family Poeciliidae (order Cyprinodontiformes). They are often called topminnows, or simply gambusias; they are also known as mosquitofish which refers to two species, Gambusia affinis and Gambusia holbrooki. 

 Extinct species 
The Amistad gambusia (Gambusia amistadensis) is the only extinct species.
Category:Cyprinodontiformes