[Phylum] Chordata Bateson, 1885 - chordates Subphylum Craniata auct. Infraphylum Vertebrata Lamarck, 1801 - vertebrates Superclass †Osteostracomorphi Class †Osteostraci Lankester, 1868 1 Order †Cephalaspidiformes Halstead Tarlo, 1967 2 Order †Thyestiformes 3 Order †Benneviaspidiformes Afanassieva, 1991