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Operculum (fish)
Bones in a fish that provide facial support structure and a protective covering for the gills / From Wikipedia, the free encyclopedia
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The operculum is a series of bones found in bony fish and chimaeras that serves as a facial support structure and a protective covering for the gills; it is also used for respiration and feeding.[1]
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Opercular series in bony fish: operculum (yellow), preoperculum (red), interoperculum (green) and suboperculum (pink)