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