Kingdom [Animalia] Linnaeus, 1758 - animals
   Ecdysozoa Aguinaldo, Turbeville, Linford, Rivera, Garey, Raff & Lake 1997, nom. cl. inval. - ecdysozoans see Clade Ecdysozoa Aguinaldo, Turbeville, Linford, Rivera, Garey, Raff & Lake 1997 [Lake, Halanych, Servin & Garey 2020]
     Panarthropoda Nielsen, 1995 - panarthropods
       Tritocerebra see [unranked] Tactopoda Budd, 2001
         Phylum Arthropoda Siebold, 1848 - arthropods
           Subphylum Arachnomorpha Heider, 1913 see [unranked] Arachnomorpha Heider, 1913
             Infraphylum Cheliceriformes
               Superclass Chelicerata Heymons, 1901 see Subphylum Chelicerata Heymons, 1901
                 Epiclass Euchelicerata Weygoldt & Paulus, 1979 see [unranked] Euchelicerata Weygoldt & Paulus, 1979
                   Class Arachnida Lamarck, 1801
                     Subclass Micrura see [unranked] Micrura Hansen & Sørensen, 1904
                       1 Order Palpigradi Thorell, 1888 - palpigrades
                       2 Order †Haptopoda Pocock, 1911
                       3 Order †Trigonotarbida Petrunkevitch, 1949
                       4 Order Araneae Clerck, 1757 - spiders
                       5 Order Amblypygida - whip scorpions see Order Amblypygi Thorell, 1883
                       6 Order Uropygida - vinegaroons see Order Uropygi Thorell, 1882
                       7 Order Schizomida Petrunkevitch, 1945 - schizomids
                       8 Order Ricinulei Thorell, 1876 - ricinuleids
                       9 Order Acari Leach, 1817 - mites, ticks and chiggers see Subclass Acari Leach, 1817