isorhiza

From ZooTerms (Dictionary of Invertebrate Zoology)
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isorhiza (noun; Greek isos, equal; rhiza, root): (Cnidaria) A form of nematocyst in which the tube is open and the same diameter along the tube, responding to mechanical stimuli, and is used in anchoring the animal when it walks on its tentacles

See also: atrichous isorhiza, holotrichous isorhiza, basitrichous isorhiza.