True coelom has evolved for the first time in:

Arthopoda

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Mollusca

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Annelida

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Platyhelminthes

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Solution

The correct option is C Annelida
A true coelom may be defined as a secondary body cavity, formed by the splitting of mesoderm during embryonic development and bounded on all sides by a definite coelomic epithelium or peritoneum. A true coelom was evolved for the first time in annelids.
So, the correct answer is C.

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