Chordata Bateson, 1885 - chordates Class Elasmobranchii Bonaparte, 1838 see Subclass Elasmobranchii Bonaparte, 1838 Subclass Selachii see Subdivision Selachii Order Cestraciontes Suborder †Janassides Family †Tamiobatidae Glikman, 1964 [monotypic] Genus †Tamiobatis Eastman, 1897 [monotypic]