[Phylum] Chordata Bateson, 1885 - chordates Subphylum Craniata auct. Infraphylum Vertebrata Lamarck, 1801 - vertebrates Superclass †Osteostracomorphi Class †Galeaspidomorphi Superorder †Polybranchiaspidida Zhu & Gai, 2007 Order †Polybranchiaspidiformes Liu, 1965 Family †Pentathyraspididae Pan, 1992 Genus †Pentathyraspis Pan, 1992