Order Opiliones Sundevall, 1833 - harvestmen
   Suborder Dyspnoi Hansen & Sørensen, 1904 - ornate harvestmen
     Superfamily Acropsopilionoidea Roewer, 1923 [monotypic]
       1 Family Acropsopilionidae Roewer, 1923
       2 Family †Halithersidae Dunlop, Selden & Giribet, 2016