[Phylum] [Arthropoda] Siebold, 1848 - arthropods
   Chelicerata Heymons, 1901
     Euchelicerata Weygoldt & Paulus, 1979
       Pantetrapulmonata Shultz, 2007
         [Order] Araneida Clerck, 1757 - spiders
           [Suborder] Araneae Clerck, 1757 - tailless spiders
             [Infraorder] Opisthothelae Pocock, 1892 - unsegmented spiders
               Araneomorphae Smith, 1902
                 Synspermiata Michalik & Ramírez, 2014
                   Lost Trachea Clade
                     Family Tetrablemmidae Pickard-Cambridge, 1873, orth. praeval.
                       01 Genus †Alticorona Wunderlich, 2021
                       02 Genus †Balticoblemma Wunderlich, 2004
                       03 Genus †Bicornoculus Wunderlich, 2015
                       04 Genus †Claspingblemma Wunderlich, 2022
                       05 Genus †Cymbioblemma Wunderlich, 2017
                       06 Genus †Electroblemma Selden, Zhang & Ren, 2016
                       07 Genus †Eogamasomorpha Wunderlich, 2008
                       08 Genus †Furcembolus Wunderlich, 2008
                       09 Genus †Longissithorax Wunderlich, 2017
                       10 Genus †Longithorax Wunderlich, 2017, nom. illeg.
                       11 Genus Monoblemma Gertsch, 1941
                       12 Genus †Palpalpaculla Wunderlich, 2017
                       13 Genus †Procerclypeus Wunderlich, 2021
                       14 Genus †Saetosoma Wunderlich, 2012
                       15 Genus †Tenuicephalus Wunderlich, 2021
                       16 Genus †Unicornutiblemma Wunderlich, 2020
                       17 Genus †Uniscutosoma Wunderlich, 2015