Cheilostomata

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Cheilostomata (subphylum Ectoprocta, class Gymnolaemata) A large order of bryozoans, whose members are highly variable in gross morphology and are characterized by the presence of a small, non-calcified operculum which covers the aperture when the soft parts are withdrawn. The order occurs since the Jurassic.

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Cheilostomata

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