1950  ?Hyattoceras (Prohyattoceras) n.sp. Gerth, fig.2.
     1987  Eohyattoceras gerthi Glenister & Furnish:
           989, fig.2.3,3.3,4.1-4.7.
     1990  Eohyattoceras gerthi.-Bogoslovskaya: textfig.1.