Tetrapulmonata Shultz, 1990
   Superorder Serikodiastida Garwood & Dunlop, 2014
     Order Araneida Clerck, 1757 - spiders
       Suborder Araneae Clerck, 1757 - tailless spiders
         Infraorder Opisthothelae Pocock, 1892 - unsegmented spiders
           Microorder Araneomorpha Smith, 1902 - araneomorphs
             Clade Basalhaplogynae see [unranked] Neocribellatae Caporiacco
               Branch Synspermiata Michalik & Ramírez, 2014
                 1 Superfamily Dysderoidea Koch, 1837
                 2 Superfamily Pholcoidea Koch, 1851
                 3 Scytodiformes
                 4 Family Tetrablemmidae Pickard-Cambridge, 1873, orth. praeval.