Angusticardinia Schuchert & Cooper, 1931 † (original description)
Angusticardiniidae Schuchert & Cooper, 1931 † (original description)
Archaeorthis Schuchert & Cooper, 1931 † (original description)
Aulacella Schuchert & Cooper, 1931 † (original description)
Bohemiella Schuchert & Cooper, 1931 † (original description)
Cariniferella Schuchert & Cooper, 1931 † (original description)
Cariniferella carinata (Hall, 1843) † (new combination reference)
Dinorthidae Schuchert & Cooper, 1931 † (original description)
Dolerorthis Schuchert & Cooper, 1931 † (original description)
Finkelnburgiidae Schuchert & Cooper, 1931 † (original description)
Hesperorthidae Schuchert & Cooper, 1931 † (original description)
Hesperorthis Schuchert & Cooper, 1931 † (original description)
Heterorthidae Schuchert & Cooper, 1931 † (original description)
Isorthinae Schuchert & Cooper, 1931 † (original description)
Mystrophoridae Schuchert & Cooper, 1931 † (original description)
Pentamerida † (original description)
Pentameridina † (original description)
Platyorthis Schuchert & Cooper, 1931 † (original description)
Protorthida † (original description)
Skenidioides Schuchert & Cooper, 1931 † (original description)
Stricklandiidae Schuchert & Cooper, 1931 † (original description)
Stricklandioidea Schuchert & Cooper, 1931 † (original description)
Taffiidae Schuchert & Cooper, 1931 † (original description)
Taffiinae Schuchert & Cooper, 1931 † (original description)