Rhynchonellata
Diplonorthis Mitchell, 1972
Nicoloidea Zeng, 1987
Nothorthis Ulrich & Cooper, 1938
Pleurorthis Cooper, 1956
Riograndella Kobayashi, 1937
Shoshonorthis Jaanusson & Basse, 1993
Xinanorthis Xu, Rong & Liu, 1974
