Biota see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain Eukarya Chatton, 1925 see Domain Eukaryota Chatton, 1925
     Supergroup Unikonta see [unranked] Unikonta
       Opisthokonta Cavalier-Smith 1987, nom. cl. inval. see Clade Opisthokonta Cavalier-Smith 1987 [Simpson & Medina 2020]
         Holozoa Lang, O'Kelly, Nerad, Gray & Burger 2002 [Adl et al. 2012] see Superkingdom Holozoa Lang, O'Kelly, Nerad, Gray & Burger, 2002
           Animalia Linnaeus, 1758 see Kingdom Animalia Linnaeus, 1758
             Eumetazoa Bütschli, 1910 - eumetazoans
               Bilateria Hatschek, 1888 - bilaterians see Subkingdom Bilateria Hatschek, 1888
                 Protostomia Grobben, 1908 see Infrakingdom Protostomia Grobben, 1908
                   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
                       Phylum Arthropoda Siebold, 1848 - arthropods
                         Chelicerata Heymons, 1901 see Superclass Chelicerata Heymons, 1901
                           1 Class Pycnogonida Latreille, 1810 - pycnogonids
                           2.1 Class Xiphosura Latreille, 1802 - horseshoe crabs
                           2.2 Class Arachnida Lamarck, 1801