Chordata Bateson, 1885 - chordates
   Class Elasmobranchii Bonaparte, 1838 see Infraclass Elasmobranchii Bonaparte, 1838
     Subclass Selachii see Division Selachii
       Order Cestraciontes
         Suborder †Janassides
           41 Family †Janassidae Jaekel, 1898
           42 Family †Psammodontidae de Koninck, 1878
           43 Family †Peripristidae Eastman, 1902
           44 Family †Cochliodontidae Owen, 1867
           45 Family †Tamiobatidae Hay, 1902 [monotypic] see Family Ctenacanthidae Bonaparte, 1850, "nom. praeval."