Table 1. Approximate rotational angles of three heteromorph ammonite designs. The dimensions of the original shells of three different designs are compared with the estimated rotational angles based on our model. All lengths to the nearest 5 mm, angles to the nearest 5°.

Shell Type Aspinocone Ancylcone Hamiticone
Genus Tropaeum Ancycloceras Hamites
Whorl height 60 cm 40 cm 30 cm
Whorl width 50 mm 20 mm 10 mm
Rotational angle 40º 50º 100º