The widemouth gambusia, Gambusia eurystoma, is a species of freshwater fish. It is a member of the family Poeciliidae of the order Cyprinodontiformes. It is native to Mexico.
This species reaches a maximum overall length of approximately 3.5 cm.
Little is known about G. eurystoma, but IUCN classifies it as Critically Endangered on the basis of a very small (less than 250 individuals) and rapidly falling population and a small, localized, and diminishing geographical distribution.
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