Chordata Bateson, 1885 - chordates Class Elasmobranchii Bonaparte, 1838 see Subclass Elasmobranchii Bonaparte, 1838 Subclass Selachii see Subdivision Selachii Order Cestraciontes Suborder †Janassides 41 Family †Janassidae Jaekel, 1899 42 Family †Psammodontidae 43 Family †Peripristidae Eastman, 1902 44 Family †Cochliodontidae Owen, 1867 45 Family †Tamiobatidae Glikman, 1964 [monotypic]