[Phylum] [Arthropoda] Siebold, 1848 - arthropods
   Chelicerata Heymons, 1901
     Euchelicerata Weygoldt & Paulus, 1979
       [Order] Opiliones Sundevall, 1833 - harvestmen
         Suborder †Tetrophthalmi Garwood, Sharma, Dunlop & Giribet, 2014 [monotypic]
           Family †Hastocularidae Kury, Dunlop & Mendes, 2020
             1 Genus †Eophalangium Dunlop, Anderson, Kerp & Hass, 2004
             2 Genus †Hastocularis Garwood, Sharma, Dunlop & Giribet, 2014