Cheilostomata
plural noun
Chei·lo·sto·ma·ta
ˌkīləˈstōmətə
: a large order of marine bryozoans (class Gymnolaemata) having the colony erect or encrusting, the zooecia more or less tubular, and the aperture closed by a chitinous operculum when the polypide is retracted
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Merriam-Webster unabridged
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