Megomphix californicus A.G. Smith, 1960 USA, California11,2 mm
Glyptostoma gabrielense H.A. Pilsbry, 1938 California. Los Angeles
Polygyroidea harfordiana (J.G. Cooper, 1870) California, Mariposa
Megomphix hemphilli (W.G. Binney, 1879) Oregon22 mm
Megomphix lutarius H.B. Baker, 1932
Glyptostoma newberryanum (W.G. Binney, 1858) California
Polygyrella polygyrella (T.B. Bland& J.G. Cooper, 1861) Oregon
Ammonitella yatesii J.G. Cooper, 1869 USA, California