[Ecdysozoa] Aguinaldo, Turbeville, Linford, Rivera, Garey, Raff & Lake 1997, nom. cl. inval. - ecdysozoans see Clade Ecdysozoa Aguinaldo, Turbeville, Linford, Rivera, Garey, Raff & Lake 1997 [Lake, Halanych, Servin & Garey 2020]
   Superphylum Panarthropoda Nielsen, 1995 see [unranked] Panarthropoda Nielsen, 1995
     Arthropoda Siebold, 1848 - arthropods see Phylum Arthropoda Siebold, 1848
       Phylum Euarthropoda Lankester, 1904 see [unranked] Euarthropoda
         1 Class †Megacheira Hou & Bergström, 1997 [paraphyletic]
         1.n.1.1 Pycnogonida Latreille, 1810 - pycnogonids
         1.n.1.2.1.1 Genus †Habelia Walcott, 1912
         1.n.1.2.1.2 Genus †Sanctacaris Briggs & Collins, 1988
         1.n.1.2.2 Euchelicerata Weygoldt & Paulus, 1979
         1.n.2 Antennulata