Kingdom Animalia Linnaeus, 1758 - animals
   Phylum Arthropoda Siebold, 1848 - arthropods
     Subphylum Chelicerata Heymons, 1901
       Class Arachnida Lamarck, 1801
         1.1 Order Opiliones Sundevall, 1833 - harvestmen
         1.2 Order Scorpiones Koch, 1837 - scorpions
         2.1 Order Solifugae Sundevall, 1833
         2.2 Order Pseudoscorpiones De Geer, 1778
         3 Order Palpigradi Thorell, 1888 - palpigrades
         4 Order †Phalangiotarbida Haase, 1890
         5 Order Ricinulei Thorell, 1876 - ricinuleids
         7.2 Order Scarcoptiformes see Order Sarcoptiformes Reuter, 1909
         8.1 Order †Trigonotarbida Petrunkevitch, 1949
         8.2.1.1 Order †Uraraneida Selden & Shear, 2008
         8.2.1.2 Order Araneae Clerck, 1757 - spiders
         8.2.2.1 Order †Haptopoda Pocock, 1911
         8.2.2.2.1 Order Amblypygi Thorell, 1883 - whip spiders
         8.2.2.2.2.1 Order Thelyphonida Latreille, 1804
         8.2.2.2.2.2 Order Schizomida Petrunkevitch, 1945 - schizomids