The echinoderm in which mouth is used for both ingestion and egestion is

Echinarachnius

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Ophiothrix

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Echinus

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Antedon

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Solution

The correct option is B Ophiothrix
A) Echinarachnius (sand dollar) has a separate mouth and anus and uses its anus for egestion.
B) Ophiothrix (brittle star) has no anus, so its mouth is used for both ingestion and egestion of food.
C) Echinus (sea urchin) has a separate mouth and anus and uses its anus for egestion and uses its mouth for ingestion.
D) Antedon (feather star) has a separate mouth and anus and uses its anus for egestion and uses its mouth for ingestion.
So the correct answer is 'Ophiothrix'.

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