Key Identification Features
- On the lower surface, the whorls are more curved, and are separated by a distinct suture.
- Some individual specimens or entire populations may have periostracal hairs and spiral features on their shells.
- In large portions of the Mediterranean region, including the Iberian Peninsula and Italy, there are distinct forms that molecular genetics have not yet confirmed as separate named species.
- The shell has a distinct keel at the center of the body whorl's periphery.
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