[Phylum] Chordata Bateson, 1885 - chordates Subphylum Craniata auct. Infraphylum Vertebrata Lamarck, 1801 - vertebrates Superclass †Pteraspidomorphi Goodrich, 1909 [monotypic] Class †Pteraspidomorpha Subclass †Astraspida Berg, 1940 [monotypic] 1 Order †Astraspidiformes Berg, 1940