Order Araneida Clerck, 1757 - spiders
   Suborder Araneae Clerck, 1757 - tailless spiders
     Infraorder Opisthothelae Pocock, 1892 - unsegmented spiders
       Microorder Araneomorpha Smith, 1902 - araneomorphs
         Neocribellatae Caporiacco
           Clade Synspermiata Michalik & Ramírez, 2014
             Subclade Pholcomorpha Wunderlich, 2020
               Clade "Laminata"
                 Clade "Connata"
                   Clade Lost Tracheae Branch
                     Superfamily Tetrablemmoidea Pickard-Cambridge, 1833 [monotypic]
                       Family Tetrablemmidae Pickard-Cambridge, 1873, orth. praeval.
                         1 Subfamily Pacullinae Simon, 1894 see Family Pacullidae Simon, 1894
                         2 Subfamily Tetrablemminae Pickard-Cambridge, 1873