Chelicerata Heymons, 1901 see Superclass Chelicerata Heymons, 1901
   Euchelicerata Weygoldt & Paulus, 1979
     [Class] Arachnida Lamarck, 1801
       [Subclass] Acari Leach, 1817 - mites and ticks
         1 [Order] Parasitiformes Reuter, 1909 see Superorder Parasitiformes Reuter, 1909
         2 [Order] Acariformes Zakhvatkin, 1952 see Superorder Acariformes Zakhvatkin, 1952