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Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Cyprinodontiformes
Family: Poeciliidae
Subfamily: Poeciliinae
Genus: Xenodexia
C. L. Hubbs, 1950
Species: X. ctenolepis
Binomial name
Xenodexia ctenolepis
C. L. Hubbs, 1950

Xenodexia is a genus of poeciliid fish. It contains the single species Xenodexia ctenolepis, the Grijalva studfish, which is endemic to Guatemala This species grows to a length of 4.5 centimetres (1.8 in) TL.