Kingdom Animalia Linnaeus, 1758 - animals Phylum Arthropoda Siebold, 1848 - arthropods Subphylum Chelicerata Heymons, 1901 Class Pycnogonida Latreille, 1810 - pycnogonids 1 Order †Palaeoisopoda Hedgpeth, 1978 [monotypic] 2 Order †Palaeopantopoda Broili, 1930 [monotypic] 3 Order †Nectopantopoda Bamber, 2007 [monotypic] 4 Order Pantopoda Gerstäcker, 1863