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Question

What are the 7 classes of mollusks?


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Solution

Mollusks:

  1. Delicate bodied, triploblastic, reciprocally even, and coelomate creatures have a place with the phylum Mollusca.
  2. Mollusks can be segregated into seven classes: Aplacophora, Monoplacophora, Polyplacophora, Bivalvia, Gastropoda, Cephalopoda, and Scaphopoda
    1. Aplacophora: Worm-like, non-shelled animals with a primitive body structure belong to the Aplacophora class.
    2. Monoplacophora: Monoplacophora members have a single shell that encloses the body.
    3. Polyplacophora: Members of the Polyplacophora class are known as "chitons" because they have a big foot on the ventral side and an eight-plate shell on the dorsal side.
    4. Bivalvia: Mollusks having two muscle-holding shells, such as oysters, clams, and moulds, belong to the Bivalvia class.
    5. Gastropoda: Members of the Gastropoda class feature an asymmetric body plan with a shell that can be planospiral or conispiral. The torsion on the centre of the foot along the perpendicular axis, which is changed for crawling, is their distinguishing trait.
    6. Cephalopoda:
    7. Scaphopoda: Mollusks of the Scaphopoda class have a conical shell through which the head protrude and a foot with tentacles called captaculae that are used to catch and manipulate prey.

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