Order Opiliones Sundevall, 1833 - harvestmen
   Phalangida Bristowe, 1949
     Suborder Laniatores Thorell, 1876 - armored harvestmen
       Grassatores Kury, 2002 see Infraorder Grassatores Kury, 2002
         Superfamily Gonyleptoidea Sundevall, 1833
           1 Family Stygnopsidae Sørensen, 1932
           2.1 Family Agoristenidae Šilhavý, 1973
           2.2.1 Family Stygnidae Simon, 1879
           2.2.2.1.1 Family Tricommatidae Roewer, 1912 see Subfamily Tricommatinae Roewer, 1912
           2.2.2.1.2 Family Gerdesiidae Sharma & Giribet, 2014, nom. nud. see Family Gerdesiidae Bragagnolo, Hara & Pinto-da-Rocha, 2015
           2.2.2.2.1.1 Family Cosmetidae Koch, 1839
           2.2.2.2.1.2 Family Metasarcidae Kury, 1994
           2.2.2.2.2 Family Gonyleptidae Sundevall, 1833