hydrocyst
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hydrocyst — see dactylozooid … Dictionary of invertebrate zoology
dactylozooid — n. [Gr. daktylos, finger; zoon, animal] (CNIDARIA: Hydrozoa) In colonial hydrozoans, a hydroid modified for protection and the capture of prey; protective polyp, zooid or machozooid; a hydrocyst; a palpon; see tentaculozooid, gastrozooid … Dictionary of invertebrate zoology