Which one of the following is a connecting link between protozoans and poriferans?

Cliona

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Leucosolenia

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Oscarella

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Proterospongia

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Solution

The correct option is D Proterospongia
Proterospongia is a colonial protozoa, having choanocytes or collar cells, like those of sponges. This species is a connecting link between Protozoa and Porifera. Choanocytes are the flagellated cells that lined the interior wall of sponge.
Hence the correct option is D.

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