10 Important Characteristics of Mollusca are given below:
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One of the characteristics of mollusca is having a soft body and is protected by a hard shell that is bilaterally symmetrical.
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Body has more than two cell layers, tissues and organs.
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Body without cavity.
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Body possesses a through gut with mouth and anus.
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Body monomeric and highly variable in form, may possess a dorsal or lateral shells of protein and calcareous spicules.
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Has a nervous system with a circum-oesophagal ring, ganglia and paired nerve chords.
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Has an open circulatory system with a heart and an aorta.
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Has gaseous exchange organs called ctenidial gills.
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Has a pair of kidneys.
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Reproduction normally sexual and gonochoristic. Ex: – Sepia, Unio, Pila etc.