Kingdom Animalia Linnaeus, 1758 - animals Phylum Arthropoda Siebold, 1848 - arthropods Subphylum Chelicerata Heymons, 1901 Class Arachnida Lamarck, 1801 Order Pseudoscorpiones De Geer, 1778 Suborder Epiocheirata Harvey, 1992 Superfamily Chthonioidea Daday, 1888 Family Tridenchthoniidae Balzan, 1892 see Subfamily Tridenchthoniinae Balzan, 1892