spirocyst

From ZooTerms (Dictionary of Invertebrate Zoology)
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spirocyst (noun; Latin spira, coil; Greek kystis, bladder): (Cnidaria: Anthozoa) In Zoantharia, a type of nematocyst with a thin, single-wall capsule that is acidophilic and contains a long, spirally coiled, unarmed thread of uniform diameter

See also: nematocyst.