[Phylum] Chordata Bateson, 1885 - chordates
   Subphylum Craniata auct.
     Infraphylum Vertebrata Lamarck, 1801 - vertebrates
       Superclass Gnathostomata Gegenbaur, 1874 - jawed vertebrates
         Class †Acanthodii Owen, 1846 - acanthodians
           Order †Acanthodiformes Berg, 1940
             Family †Acanthodidae Agassiz, 1844
               1 Genus †Acanthodes Agassiz, 1833
               2 Genus †Acanthoessus Agassiz, 1832, nom. nud. see Genus Acanthodes Agassiz, 1833
               3 Genus †Howittacanthus Long, 1986