Stylasterina

invertebrate order

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In cnidarian: Annotated classification
Order Stylasterina Hydrocorals. Resembling millepores; colonies erect and branching or prostrate. Commonly yellow, red, or purple. Reduced medusae not freed; develop and produce gametes in cavities of skeleton (ampullae). Worldwide; includes precious red coral, Corallium. Order Trachylina Medusa dominant; reduced or
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