[Subphylum] [Chelicerata] Heymons, 1901
   [Order] Araneae Clerck, 1757 - spiders see Suborder Araneae Clerck, 1757
     Suborder Opisthothelae Pocock, 1892 - modern spiders see Infraorder Opisthothelae Pocock, 1892
       Infraorder Araneomorphae Smith, 1902 see [unranked] Araneomorphae Smith, 1902
         Synspermiata Michalik & Ramírez, 2014
           Lost Tracheae clade
             1 Family Pholcidae Koch, 1850
             2.1.1 Family Tetrablemmidae Pickard-Cambridge, 1873, orth. praeval.
             2.1.2 Family Diguetidae Pickard-Cambridge, 1899
             2.2.1 Family Pacullidae Simon, 1894
             2.2.2 Family Plectreuridae Simon, 1893