Chordata Bateson, 1885 - chordates
   Class Elasmobranchii Bonaparte, 1838 see Infraclass Elasmobranchii Bonaparte, 1838
     Subclass Selachii see Division Selachii
       Order †Ichthyotomi (Cope)
         Family †Cladodontidae Giebel, 1846 see Family Ctenacanthidae Bonaparte, 1850, "nom. praeval."