Chelicerata Heymons, 1901
   Opiliones Sundevall, 1833 - harvestmen
     Phalangida Bristowe, 1949
       Suborder Dyspnoi Hansen & Sørensen, 1904 - ornate harvestmen
         Superfamily Ischyropsalidoidea Simon, 1879
           1 Genus †Piankhi Dunlop, Bartel & Mitov, 2012
           2 Family Ceratolasmatidae Shear, 1986 see Subfamily Ceratolasmatinae Shear, 1986
           3 Family Ischyropsalididae Simon, 1879
           4 Family Sabaconidae Dresco, 1970