From ZooTerms (Dictionary of Invertebrate Zoology)
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corona (noun; Latin corona, crown): 1. A crownlike structure or organ of various invertebrates.

2. (Arthropoda: Insecta) In Lepidoptera male genitalia, a specialized row of armament setae, teeth or spines on the cucullus.

3. (Echinodermata) a. In Crinoidea, a central mass and arms: a crown. b. In Echinoidea, a test, minus the apical system.

4. (Rotifera) A main ciliary wreath surrounding the mouth of a rotifer.