Xenodexia

{{Short description|Genus of fishes}}

{{Speciesbox

| status = DD

| status_system = IUCN3.1

| status_ref = {{cite iucn |author=Espinosa Pérez, H. |author2=Matamoros, W.A. |date=2019 |title=Xenodexia ctenolepis |volume=2019 |page=e.T191773A2002862 |doi=10.2305/IUCN.UK.2019-2.RLTS.T191773A2002862.en |access-date=20 November 2021}}

| image =

| image_caption =

| grandparent_authority = C. L. Hubbs, 1950

| parent_authority = C. L. Hubbs, 1950

| taxon = Xenodexia ctenolepis

| display_parents = 3

| authority = 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 river basins in Guatemala where it lives in both slow- and fast-flowing waters. Females reach up to {{cvt|4.5|cm|in}} in total length and males are somewhat smaller.{{FishBase |genus= Xenodexia|species= ctenolepis| month = August | year = 2018}} It is the only member of the subfamily Xenodexiinae.{{Cite web |title=CAS - Eschmeyer's Catalog of Fishes |url=https://researcharchive.calacademy.org/research/ichthyology/catalog/fishcatmain.asp |access-date=2025-03-15 |website=researcharchive.calacademy.org |language=en}}