13274 Urobatis concentricus Osburn & Nichols, 1916 Urotrygonidae American round stingrays Myliobatiformes Elasmobranchii Reef stingray Eastern Central Pacific: Gulf of California and scattered localities of Mexico. UBC 570108 19 N 104 W Urobates concentricus AMNH 15692 1936 Urolophus concentricus AMNH 15693 1937 Urolophus concentricus CICIMAR-IPN 1308 1981 Urolophus concentricus 1 m CICIMAR-IPN 1348 1985 Urolophus concentricus 3 m CICIMAR-IPN 4040 1986 Urolophus concentricus 16 m