Chordata Bateson, 1885 - chordates
   Class †Ostracophori
     Order †Heterostraci Lankester, 1868 - heterostracans see Subclass Heterostraci Lankester, 1868
       Family †Ceraspidae Woodward, 1891, nom. illeg. [monotypic] see Family Pterichthyodidae Stensiö, 1948
         1 Genus †Ceraspis Schlüter, 1887, nom. illeg. see Genus Grossaspis White & Moy-Thomas, 1940