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In this article we will discuss about the structure of Terebra & Terebellum (Shankh) with the help of a diagram.
1. They are called “turret shells” and are marine molluscs.
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2. They exhibit torsion and the nervous system is twisted in a figure of 8.
3. In these molluscs the left side has completely atrophied.
4. They have single auricle, nephridium, ospharidium and ctenidium.
5. The foot is operculate and large.
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6. Ctenidium is monopectinate and comb-like.
7. Ospharidium is pectinate.
8. Sexes are separate and development through trochophore larva.