Image of Cyclophoroidea

Description:

Figures 6.Different types of parietal constriction teeth before the operculum resting site, in bottom view. A two long lamellae run parallel to the whorl growing direction B two short ridges run parallel to the whorl growing direction, each knob-shaped at one end C a single ridge runs parallel to the whorl growing direction, knob-shaped at one end D no tooth.