Chordata Bateson, 1885 - chordates
   Class Elasmobranchii Bonaparte, 1838 see Infraclass Elasmobranchii Bonaparte, 1838
     Subclass Selachii see Division Selachii
       Order Cestraciontes
         Suborder †Janassides
           Family †Tamiobatidae Hay, 1902 [monotypic] see Family Ctenacanthidae Bonaparte, 1850, "nom. praeval."
             1 Genus †Tamiobatis Eastman, 1897 [monotypic]