Chelicerata Heymons, 1901
   Opiliones Sundevall, 1833 - harvestmen
     Phalangida Bristowe, 1949
       Suborder Dyspnoi Hansen & Sørensen, 1904 - ornate harvestmen
         Superfamily Acropsopilionoidea Roewer, 1923 [monotypic]
           1 Family Acropsopilionidae Roewer, 1923