Kingdom Animalia Linnaeus, 1758 - animals
   Phylum Arthropoda Siebold, 1848 - arthropods
     Subphylum Cheliceriformes
       Class Chelicerata Heymons, 1901
         Subclass Arachnida Lamarck see Class Arachnida Lamarck, 1801
           Order Acari Leach, 1817 - mites, ticks and chiggers see Subclass Acari Leach, 1817
             Suborder Acariformes (Zakhvatkin, 1952) - mites and chiggers see Order Acariformes Zakhvatkin, 1952
               Genus Scirus Hermann, 1804 see Genus Bdella Latreille, 1795