Key Identification Features
- The anterior and posterior ends of the shell have a faint purple tint, and a depressed pustule is surrounded by a yellow circle at its edge; this feature gives the species its Latin name verrucosus.
- The shell is usually elongated in shape, and its dorsum features a thick transverse ridge.
- nectarea can usually be distinguished by an additional faint dark band near the shell centre that P.
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