The Mexican stoneroller (Campostoma ornatum) is a species of fish native to Arizona and Texas in the United States and parts of adjacent Mexico. It belongs to the carp family, Cyprinidae. There are three other species in this genus, Campostoma anomalum (the central stoneroller), Campostoma oligolepis (the largescale stoneroller), and Campostoma pauciradii (the bluefin stoneroller), which are morphologically similar.