Kingdom [Animalia] Linnaeus, 1758 - animals
   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
       Tritocerebra see [unranked] Tactopoda Budd, 2001
         Phylum Arthropoda Siebold, 1848 - arthropods
           Subphylum Arachnomorpha Heider, 1913 see [unranked] Arachnomorpha Heider, 1913
             Infraphylum Cheliceriformes
               1 Superclass †Sidneyiida see Superclass Lamellipedia Hou & Bergström, 1997
               2 Superclass †Emeraldellida Størmer, 1944 see Order Emeraldellida Størmer, 1944
               3 Superclass †Sanctacarida
               4 Superclass Chelicerata Heymons, 1901 see Subphylum Chelicerata Heymons, 1901