FAMILY                      Palaeopisthacanthidae Kjellesvig-Waering, 1986:232  [Fossil]
GENUS                              Compsoscorpius Petrunkevitch, 1949:149  [type is elegansFossil]
SPECIES                                 Compsoscorpius elegans Petrunkevitch, 1949:149 [Fossil; u.Carb.; England]
                                        [=Typhlopisthacanthus anglicus Petrunkevitch, 1949:145]
                                        [=Compsoscorpius elongatus Petrunkevitch, 1949:150]
GENUS                              Cryptoscorpius Jeram, 1994:536  [type is americanusFossil]
SPECIES                                 Cryptoscorpius americanus Jeram, 1994a:538 [Penn.Fossil; u.Carb.; Kansas]
GENUS                              Palaeopisthacanthus Petrunkevitch, 1913:35  [type is schuchertiFossil]
SPECIES                                 Palaeopisthacanthus schucherti Petrunkevitch, 1913:48 [Fossil; u.Carb.; Illinois]
SPECIES                                 Palaeopisthacanthus vogelandurdeni Jeram, 1994a:526 [Fossil; u.Carb.; Kansas]