Asymmetrical sponges mostly occur in

Calcarea

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Hexactinellida

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Demospongiae

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All the above

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Solution

The correct option is D Demospongiae
A. Sponges of class Calcarea have cylindrical or vase like body shape. Hence, they can be radially symmetrical.
B. Sponges of class Hexactinellida have cup shape, urn shape or vase like body shape. Hence, they can be radially symmetrical.
C. Sponges of class Demospongiae have an irregular body shape. The body symmetry is lost due to presence of most complicated canal system i.e. leuconoid canal system.
Hence, asymmetrical sponges mostly occur in Demospongiae.
So, the correct answer is 'Demospongiae'.

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