Superphylum Deuterostomia Grobben, 1908 - deuterostomes see Infrakingdom Deuterostomia Grobben, 1908
   Phylum Chordata Bateson, 1885 - chordates
     Subphylum Craniata auct.
       Vertebrata Lamarck, 1801 - vertebrates see Infraphylum Vertebrata Lamarck, 1801
         Myopterygii Janvier, 1978 - myopterygians
           Superclass Gnathostomata Gegenbaur, 1874 - jawed vertebrates
             Grade Chondrichthiomorphi see Grade Chondrichthyomorphi
               Class Chondrichthyes Huxley, 1880 - cartilaginous fishes
                 Subclass Elasmobranchii Bonaparte, 1838 - shark-like fishes see Infraclass Elasmobranchii Bonaparte, 1838
                   1 [stem] Genus †Plesioselachus Anderson, Long, Gess & Hiller, 1999
                   2 Order †Squatinactiformes Zangerl, 1981, incertae sedis [monotypic]
                   3 Order †Protacrodontiformes incertae sedis
                   4 Infraclass †Cladoselachimorpha see Superorder Cladoselachimorpha
                   5 Infraclass †Xenacanthimorpha see Superorder Xenacanthimorpha
                   6 Infraclass Euselachii Hay, 1902 - sharks and rays, and related fossils see Subclass Euselachii Hay, 1902