Kingdom Animalia Linnaeus, 1758 - animals
   Phylum Arthropoda Siebold, 1848 - arthropods
     Subphylum Chelicerata Heymons, 1901
       Class Arachnida Lamarck, 1801
         Order Opiliones Sundevall, 1833 - harvestmen
           Suborder Eupnoi Hansen & Sørensen, 1904 - daddy longlegs
             1 Superfamily Caddoidea Banks, 1893 [monotypic]
             2 Superfamily Phalangioidea Latreille, 1802
             3 [Family Stygophalangiidae Oudemans, 1933]