Urotrygon cimar, the Cimar round ray, is a type of tropical marine ray found exclusively in the eastern central Pacific ocean, specifically south coastal regions stretching from Mexico to Costa Rica.^[1][2]

This species can be distinguished from several characteristics: round disc; short tail; tan or yellow-brown dorsal surface, covered with irregular brown or black spots/blotches; white ventral surface with disc's lateral margins; and dark brown or gray posterior border of pelvic fins.^[2] The maximum total length of this species is approximately 38 cm.^[2]

This stingray inhabits shallow coastal regions in Chiapas and Oaxaca states of Mexico, Guatemala, El Salvador, Corinto town of Nicaragua, and Nicoya Gulf of Costa Rica.^[1][2] It is mostly found in tide pools and to a depth of 85 m, albeit usually recorded in waters shallower than 10 m.^[2]