Phylum Arthropoda Siebold, 1848 - arthropods Subphylum †Artiopoda Hou & Bergström, 1997 Superclass †Vicissicaudata Ortega-Hernández, Legg & Braddy, 2013 Order †Aglaspidida Walcott, 1911 Family †Aglaspididae Miller, 1887 Genus †Aglaspisᵀ Hall, 1862 1 †Aglaspis spinifer Raasch, 1939