(anatomy, zoology) An operculum; a series of bones found in bony fish that serves as a facial support structure and a protective covering for the gills.
Opercular series in bony fish: operculum (yellow), preoperculum (red), interoperculum (green) and suboperculum (pink)
(anatomy, zoology) An operculum; a series of bones found in bony fish that serves as a facial support structure and a protective covering for the gills.
Operculum of a European perch