Chordata Bateson, 1885 - chordates
   Class Elasmobranchii Bonaparte, 1838 see Subclass Elasmobranchii Bonaparte, 1838
     Subclass Selachii see Subdivision Selachii
       Order †Ichthyotomi (Cope)
         Family †Chondrenchelyidae Berg, 1940 [monotypic]
           1 Genus †Chondrenchelys Traquair, 1888