[Phylum] [Arthropoda] Siebold, 1848 - arthropods
   Chelicerata Heymons, 1901
     Euchelicerata Weygoldt & Paulus, 1979
       [Subclass] Acari Leach, 1817 - mites and ticks
         [Order] Parasitiformes Reuter, 1909 see Superorder Parasitiformes Reuter, 1909
           1 Suborder Opilioacarida Zachvatkin, 1952 [monotypic] see Order Opilioacarida Zakhvatkin, 1952
           2 Suborder Holothyrida Thon, 1905 see Order Holothyrida Thon, 1905
           3 Suborder Ixodida Leach, 1815 see Order Ixodida Leach, 1815
           4 Suborder Mesostigmata Canestrini, 1891 see Order Mesostigmata Canestrini, 1891