[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
                 CY Spigot Clade Wheeler et al., 2017
                   Entelegynae Simon, 1893
                     'Canoe Tapetum' Clade
                       Tibial Apophysis Clade Wunderlich, 2021
                         Retrolateral Tibial Apophysis Clade
                           Dionycha Petrunkevitch, 1928
                             Family Eutichuridae Lehtinen, 1967 see Family Cheiracanthiidae Wagner, 1887
                               Genus Strotarchus Simon, 1888