Phylum Arthropoda Siebold, 1848 - arthropods Subphylum †Artiopoda Hou & Bergström, 1997 Superclass †Vicissicaudata Ortega-Hernández, Legg & Braddy, 2013 Genus †Emeraldella Walcott, 1912 †Emeraldella brockii orth. inval. see Emeraldella brocki Walcott, 1912