Which of the following members of the phylum Mollusca would be characterised by a reduced head, a mantle that surrounds the entire body and a tusk shaped shell?

Patella

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Dentalium

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Unio

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Sepia

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Solution

The correct option is B Dentalium
Dentalium commonly known as elephant's tusk shell is a marine mollusc which inhabits shallow to deep sea water. It has a worm like body, enclosed in a curved tubular shell open at both the ends. Head is rudimentary and lacks eyes and true tentacles. Foot is pointed and used for digging. Respiration occurs by mantle that surrounds the whole body. It lives buried keeping tip of the shell exposed.
Thus, the correct answer is option B.

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