Tetrapulmonata Shultz, 1990
   Superorder Serikodiastida Garwood & Dunlop, 2014
     Order Araneida Clerck, 1757 - spiders
       Suborder Araneae Clerck, 1757 - tailless spiders
         Infraorder Mesothelae Pocock, 1892 - segmented spiders
           1 Family Heptathelidae see Family Liphistiidae Thorell, 1869
           2 Family Liphistiidae Thorell, 1869 [monotypic]
           3 Family †Burmathelidae Wunderlich, 2017 [monotypic]
           4 Family †Cretaceothelidae Wunderlich, 2017 [monotypic]
           5 Family †Parvithelidae Wunderlich, 2017 see Family Arthromygalidae Petrunkevitch, 1923
           6 Family †Eomesothelidae Wunderlich, 2019
           7 [plesion] Genus †Eothele Selden, 1996, nom. illeg. see Genus Palaeothele Selden, 2000