Kingdom Animalia Linnaeus, 1758 - animals Phylum Arthropoda Siebold, 1848 - arthropods Subphylum Chelicerata Heymons, 1901 Class Pycnogonida Latreille, 1810 - pycnogonids Order †Palaeopantopoda Broili, 1930 [monotypic] 1 Family †Palaeopantopodidae Hedgpeth, 1955