[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
           Suborder Opilioacarida Zachvatkin, 1952 [monotypic] see Order Opilioacarida Zakhvatkin, 1952
             Superfamily Opilioacaroidea With, 1902 [monotypic]
               Family Opilioacaridae With, 1903
                 1 Genus Opilioacarus With, 1903
                 2 Genus Paracarus Chamberlin & Mulaik, 1942