Chelicerata Heymons, 1901
   †Trigonotarbida Petrunkevitch, 1949
     Family †Palaeocharinidae Hirst, 1923
       1 Genus †Aculeatarbus Shear, Selden & Rolfe, 1987
       2 Genus †Gelasinotarbus Shear, Selden & Rolfe, 1987
       3 Genus †Gigantocharinus Shear, 2000
       4 Genus †Gilboarachne Shear, Selden & Rolfe, 1987
       5 Genus †Palaeocharinus Hirst, 1923
       6 Genus †Spinocharinus Poschmann & Dunlop, 2011