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In this article we will discuss about the structure of Ctenoplana with the help of a diagram.
1. It is a small, marine animal and is found on the coast of Sumatra Indo-China and Japan. Its colour is olive green or brown above.
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2. It swims freely and also creeps on its ciliated ventral surface which has mouth in the centre.
3. Body is circular and dorso-ventrally flattened and has two pinnate retractile tentacles.
4. In the middle of dorsal (aboral) surface lies the sense organ with statolith surrounded by a ring of ciliated tentacles.
5. Canal system is present in a modified form.
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6. There are eight small swimming plates which serve as locomotory organs.
7. Only Male gonads are present.
