[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 Order †Psammodontiformes Obruchev, 1953 [monotypic] Family †Psammodontidae de Koninck, 1878 1 Genus †Psammodus Agassiz, 1834