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]
   Panarthropoda Nielsen, 1995 - panarthropods
     Arthropoda Siebold, 1848 - arthropods see Phylum Arthropoda Siebold, 1848
       1 Genus †Megadictyon Luo & Hu, 1999
       2.1 Genus †Pambdelurion Budd, 1998
       2.2.1 Genus †Opabinia Walcott, 1912
       2.2.2.1 †Radiodonta see Order Radiodonta Collins, 1996
       2.2.2.2.1 Genus †Schinderhannes Kühl et al., 2009
       2.2.2.2.2.1 †Fuxianhuiida Bousfield, 1995 see Order Fuxianhuiida Bousfield, 1995
       2.2.2.2.2.2 †Canadaspidida Novozhilov, 1960 see Order Canadaspidida Novozhilov, 1960
       2.2.2.2.2.3.1 ?[stem] †Megacheira Hou & Bergström, 1997 [paraphyletic] see Class Megacheira Hou & Bergström, 1997
       2.2.2.2.2.3.1.n Chelicerata s.l. Heymons, 1901 see Superclass Chelicerata Heymons, 1901
       2.2.2.2.2.3.2.1 Genus †Devonohexapodus Haas, Waloszek & Hartenberger, 2003 see Genus Wingertshellicus Briggs & Bartles, 2001
       2.2.2.2.2.3.2.2 Mandibulata see Subphylum Mandibulata Snodgrass, 1938