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 Uropygi Thorell, 1882 - whip scorpions see [unranked] Uropygi Thorell, 1882 Genus Mastigoproctus Pocock, 1894