Which of the following animal phyla does not possess a coelom?

Platyhelminthes

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Annelida

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Mollusca

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Echinodermata

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Solution

The correct option is A Platyhelminthes
The body cavity between the body wall and the gut wall, lined by mesoderm, is called coelom. Animals possessing coelom are called coelomates, e.g. annelids, molluscs, arthropods, echinoderms, hemichordates and chordates. The animals in which the body cavity is absent are called acoelomates, e.g. platyhelminthes.

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