The rhynchocoel is a body plan feature found only in

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The rhynchocoel, a fluid-filled cavity, is a unique characteristic found only in ribbon worms (phylum Nemertea). None of the other options listed have this feature. Bryozoans and brachiopods are both members of the Lophotrochozoa superphylum, but they do not have a rhynchocoel. Rotifers have a pseudocoelom rather than a true coelom or rhynchocoel, and flatworms have a primitive body plan lacking many advanced features like a rhynchocoel.

The Rhynchocoel Is a Body Plan Feature Found Only in