Kingdom Animalia Linnaeus, 1758 - animals
   Phylum Arthropoda Siebold, 1848 - arthropods
     Subphylum Chelicerata Heymons, 1901
       Class Arachnida Lamarck, 1801
         Superorder Parasitiformes Reuter, 1909 - ticks and ticklike mites
           Order Mesostigmata Canestrini, 1891
             Suborder Sejida Kramer, 1885
               Superfamily Sejoidea Berlese, 1885
                 1 Family Ichthyostomatogasteridae Sellnick, 1953
                 2 Family Sejidae Berlese, 1885
                 3 Family Uropodellidae Camin, 1955