''Xenodexia'' is a genus of

poeciliid The Poeciliidae are a family of freshwater fishes of the order Cyprinodontiformes, the tooth-carps, and include well-known live-bearing aquarium fish, such as the guppy, molly, platy, and swordtail. The original distribution of the family was ...

fish. It contains the single species ''Xenodexia ctenolepis'', the Grijalva studfish, which is

endemic Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found else ...

to river basins in Guatemala where it lives in both slow- and fast-flowing waters. Females reach up to in

total length Fish measurement is the measuring of individual fish and various parts of their anatomies. These data are used in many areas of ichthyology, including taxonomy and fisheries biology. Overall length * Standard length (SL) is the length of a fish ...

and males are somewhat smaller.

References

Poeciliidae Endemic fauna of Guatemala Fish of Guatemala Freshwater fish of Central America Monotypic freshwater fish genera Taxa named by Carl Leavitt Hubbs Fish described in 1950 {{Cyprinodontiformes-stub