Cyprinodon rubrofluviatilis
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 rubrofluviatilis refers to the Red River.