From ZooTerms (Dictionary of Invertebrate Zoology)
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gymnocyst (noun; Greek gymnos, bare; kystis, bladder): 1. (Bryozoa) A simple type of wall morphology that adds exterior walls to the ends of interior walls, thereby separating adjacent zooids that remain in communication through interzooidal pores.

2. (Bryozoa: Gymnolaemata) In cheilostomates, continuous or partial frontal shield formed by calcification of the zooidal frontal wall or by cuticle covered spots on the frontal wall.