[Phylum] Chordata Bateson, 1885 - chordates
   Subphylum Craniata auct.
     Infraphylum Vertebrata Lamarck, 1801 - vertebrates
       Superclass Gnathostomata Gegenbaur, 1874 - jawed vertebrates
         Class Chondrichthyes Huxley, 1880 - cartilaginous fishes
           Subclass Holocephali Bonaparte, 1832
             Superorder Holocephalimorpha Lund, 1986
               Cochliodontomorpha
                 Order †Menaspiformes Patterson, 1965
                   Family †Deltoptygiidae van der Laan, 2018, orth. inval. see Family Deltoptychiidae Patterson, 1965
                     Genus †Deltoptygius van der Laan, 2018, orth. inval. see Genus Deltoptychius Morris & Roberts, 1862