urn bodies

From ZooTerms (Dictionary of Invertebrate Zoology)
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urn bodies: 1. (Mesozoa: Rhombozoa) An urn-like sac on the ventral surface of infusoriform larvae of a dicyemid that contains four germinal cells.

2. (Sipuncula) Vase-shaped, multicellular structures in the coelom.

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