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.
                         Subfamily Tetrablemminae Pickard-Cambridge, 1873
                           1 Genus †Bicornoculus Wunderlich, 2015
                           2 Genus †Cymbioblemma Wunderlich, 2017
                           3.1 Genus †Electroblemma Selden, Zhang & Ren, 2016
                           3.2 Genus Sinamma Lin & Li, 2014
                           4 Genus †Eogamasomorpha Wunderlich, 2008
                           5 Genus †Unicornutiblemma Wunderlich, 2020