Chelicerata Heymons, 1901
   †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