Phylum Euarthropoda Lankester, 1904 see [unranked] Euarthropoda
Count: †2c;3f;26g;9s
   Subphylum †Artiopoda Hou & Bergström, 1997
  Count: †2c;3f;26g;9s
     Superclass †Vicissicaudata Ortega-Hernández, Legg & Braddy, 2013
    Count: †3g
       Genus †Sidneyia Walcott, 1911
      Count: -