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Which class of Mollusca represents the p...

Which class of Mollusca represents the primitive molluscs? What are their chief features?

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The primitive molluscs are represents the class Aplacophora of Phylum - Mollusca.
These are primitive forms with .worm like body. These are marine forms without mantle, shell, out and nephridia. Head is poorly developed. A.rasping organ radula is present in buccal cavity. Cuticle contains calcareous spicules. Eyes, statocysts and tentacles are absent. Heart consists of a single auricle and a ventricle. A pair of gonads are present in some, there is a.mid-ventral groove which is homologous to the foot of the other molluscs.
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