Megomphix californicus A.G. Smith, 1960
Glyptostoma gabrielense H.A. Pilsbry, 1938
Polygyroidea harfordiana (J.G. Cooper, 1870)
Megomphix hemphilli (W.G. Binney, 1879)
Megomphix lutarius H.B. Baker, 1932
Glyptostoma newberryanum (W.G. Binney, 1858)
Polygyrella polygyrella (T.B. Bland & J.G. Cooper,1861)
Ammonitella yatesii J.G. Cooper, 1869