Chelicerata Heymons, 1901
   Opiliones Sundevall, 1833 - harvestmen
     Phalangida Bristowe, 1949
       Suborder Laniatores Thorell, 1876 - armored harvestmen
         Infraorder Grassatores Kury, 2002
           Superfamily Assamioidea Sørensen, 1884
             1 Family Assamiidae Sørensen, 1884
             2 Family Epedanidae Sørensen, 1886
             3 Family Petrobunidae Sharma & Giribet, 2011
             4 Family Pyramidopiidae Dunlop, Penney & Jekel, 2012, orth. inval. see Family Pyramidopidae Sharma, Prieto & Giribet, 2011
             5 Family Stygnopsidae Sørensen, 1932
             6 Family Tithaeidae Sharma & Giribet, 2011