[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 †Diplacanthiformes Berg, 1940 Family †Diplacanthidae Bleeker, 1859 1 Genus †Diplacanthus Agassiz, 1844