Which one of the following animals is a protostome?

Acorn worm

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Spiny skinned animal

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Alphidium

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Echidna

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Solution

The correct option is C Alphidium
Protostomes include flatworms, annelids, arthropods, molluscs and some minor phyla. During embryonic development, blastopore forms the mouth on the anterior end and anus appears later to complete the alimentary canal. Only Alphidium is protostome whereas all other options are deuterostome in which blastopore forms anus during embryonic development and represents the posterior end of the body. Mouth is formed later.
Therefore, the correct answer is option C.

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