[Phylum] [Arthropoda] Siebold, 1848 - arthropods
   Chelicerata Heymons, 1901
     Euchelicerata Weygoldt & Paulus, 1979
       Pantetrapulmonata Shultz, 2007
         [Order] †Trigonotarbida Petrunkevitch, 1949
           Family †Eophrynidae Karsch, 1882
             1 Genus †Eophrynus Woodward, 1871
             2 Genus †Nyranytarbus Harvey & Selden, 1995
             3 Genus †Petrovicia Fritsch, 1904
             4 Genus †Planomartus Petrunkevitch, 1953
             5 Genus †Pleophrynus Petrunkevitch, 1945
             6 Genus †Pocononia Petrunkevitch, 1953
             7 Genus †Somaspidion Jux, 1982
             8 Genus †Stenotrogulus Fritsch, 1904