[Arthropoda] Siebold, 1848 - arthropods see Phylum Arthropoda Siebold, 1848
   1.1 Mandibulata see Subphylum Mandibulata Snodgrass, 1938
   1.2 †Megacheira Hou & Bergström, 1997 see Class Megacheira Hou & Bergström, 1997
   2.1 †Artiopoda Hou & Bergström, 1997 see Subphylum Artiopoda Hou & Bergström, 1997
   2.2.1.1.1 Genus †Aglaspis Hall, 1862
   2.2.1.1.2 Genus †Cheloniellon Broili, 1932
   2.2.1.2 Genus †Marrella Walcott, 1912 - lace crab
   2.2.2.1.1 Genus †Habelia Walcott, 1912
   2.2.2.1.2 Genus †Sanctacaris Briggs & Collins, 1988
   2.2.2.2 Euchelicerata Weygoldt & Paulus, 1979