Cheilostomata, an order of Bryozoa in the class Gymnolaemata, are exclusively marine, colonial invertebrate animals. Cheilostome colonies are composed of calcium carbonate and grow on a variety of surfaces, including rocks, shells, seagrass and kelps. The colony shapes range from simple encrusting sheets to erect branching and even unattached form...
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http://en.wikipedia.org/wiki/Cheilostomata
major division of the bryozoans (small, colonial, aquatic invertebrate animals) that first appeared during the Jurassic period (208 to 144 million ... [2 related articles]
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http://www.britannica.com/eb/a-z/c/62
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