(C) The mollusk known as the tusk shell is $Dentalium$. It belongs to the class $Scaphopoda$ of the phylum $Mollusca$. These organisms possess a tubul

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(C) The mollusk known as the tusk shell is $Dentalium$. It belongs to the class $Scaphopoda$ of the phylum $Mollusca$. These organisms possess a tubular,conical shell that is open at both ends,resembling an elephant's tusk,hence the name 'tusk shell'.