Cyprinodon rubrofluviatilis, known as the Red River pupfish, is a species of pupfish from the United States. It is found only in the Red River of the South and Brazos River drainages of Texas and Oklahoma. It grows to a total length of and feeds on midge larvae and other insects. It was first described by Henry Weed Fowler in 1916, as a subspecies of the species Cyprinodon bovinus; the specific epithet refers to the Red River. References Further reading rubrofluviatilis Endemic fauna of Oklahoma Endemic fauna of Texas Fish of the Eastern United States Freshwater fish of the United States Brazos River Red River of the South Taxa named by Henry Weed Fowler Fish described in 1916