Kingdom Animalia Linnaeus, 1758 - animals Phylum Arthropoda Siebold, 1848 - arthropods Subphylum Cheliceriformes Class Pycnogonida Latreille, 1810 - pycnogonids Family Ammotheidae Dohrn, 1881 Genus Achelia Hodge, 1864 Genus Ammothella Verrill, 1900 Genus Eurycyde Schiödte, 1857 Genus Rhynchothorax Costa, 1861