hydra-tuba

From ZooTerms (Dictionary of Invertebrate Zoology)
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hydra-tuba (noun; Greek hydor, water; tuba, horn): (Cnidaria: Scyphozoa) A simple polyp-like stage that may produce a few more polyps, but all bud off larvae known as ephyrae, which bud like a hydra

See also: scyphistoma.