Which of the following is not an ascidian?

Bottom living

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Test permanent, well developed thick

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Pharynx large with many gill slits

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Sexes are separate with no free swimming larva

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Solution

The correct option is D Sexes are separate with no free swimming larva
Ascidian belongs to the class in the tunicata subphylum. They remain attached to the substratum. They are characterized by a tough outer 'tunic' which is made of the polysaccharide tunicin. The pharynx is ciliated. The pharynx contains holes. The cilia are arranged in a grid pattern around the circumference. The ascidians are hermaphrodites. Both male and female reproductive organs are developed in the same organism. The larvae are sessile which means that they are attached to the substratum. They are not free living.
Thus, the correct answer is option D.

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