[Phylum] Chordata Bateson, 1885 - chordates Subphylum Craniata auct. Infraphylum Vertebrata Lamarck, 1801 - vertebrates Superclass †Pteraspidomorphi Goodrich, 1909 [monotypic] Class †Pteraspidomorpha Subclass †Arandaspida 1 Order †Arandaspidiformes Ritchie & Gilbert-Tomlinson, 1977 [monotypic]