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 Opiliones Sundevall, 1833 - harvestmen
             Genus Caddo Banks, 1892
             Genus Leiobunum Koch, 1839
             Genus Trogulus Latreille, 1802