Kingdom Animalia Linnaeus, 1758 - animals Phylum Arthropoda Siebold, 1848 - arthropods Subphylum Cheliceriformes Class Chelicerata Heymons, 1901 Subclass Arachnida Lamarck see Class Arachnida Lamarck, 1801 Order Pseudoscorpionida Latreille, 1817 - false scorpions see Order Pseudoscorpiones De Geer, 1778 Genus Chthonius Koch, 1843