living organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Eukaryotae see Domain Eukaryota Chatton, 1925
     Kingdom Animalia Linnaeus, 1758 - animals
       Subkingdom Eumetazoa Butschli, 1910 see [unranked] Eumetazoa Bütschli, 1910
         Phylum Arthropoda Siebold, 1848 - arthropods
           Subphylum Chelicerata Heymons, 1901
             Class Pycnogonida Latreille, 1810 - pycnogonids
               01 Family Nymphonidae Wilson, 1878
               02 Family Callipallenidae Hilton, 1942
               03 Family Phoxicilidiidae see Family Phoxichilidiidae Sars, 1891
               04 Family Ammotheidae Dohrn, 1881
               05 Family Tanystylidae see Family Ammotheidae Dohrn, 1881
               06 Family Endeidae Norman, 1908
               07 Family Pycnogonidae Wilson, 1878
               08 Family Colossendeidae Jarzynsky, 1870
               09 Family Rhynchothoracidae Thompson, 1909
               10 Family Austrodecidae Stock, 1954