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Opercular series in bony fish: operculum (yellow), preoperculum (red), interoperculum (green) and suboperculum (pink) 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.
Turbinidae have a strong, thick calcareous operculum readily distinguishing them from the somewhat similar Trochidae or top snails, which have a corneous operculum. This strong operculum serves as a passive defensive structure against predators that try to enter by way of the aperture or that would break the shell at the outer lip.
The operculum is flat and brown inside with four whorls and subceutral nucleus. Its outer surface is very convex, smooth and shining, brown or yellowish in the middle portion, lighter and obliquely striate toward the outer margin, white and smooth on margin of increment.
The operculum lies on the top rear part of the foot. When the foot is retracted, the operculum is rotated 180° and closes the shell. [2] An operculum (fish), a flap that covers the gills in bony fishes and chimaeras. The cover that rapidly opens a cnida of a cnidarian such as a jellyfish or a sea anemone. The lid may be a single hinged flap or ...
Turbinella pyrum, common names the chank shell, sacred chank or chank, also known as the divine conch or referred to simply as a conch, is a species of very large sea snail with a gill and an operculum, a marine gastropod mollusk in the family Turbinellidae. This species occurs in the Indian Ocean.
Apertural view of a live but retracted Strombus pugilis out of water in a human hand showing the brown operculum. The maximum recorded shell length is 110 mm [1] or up to 130 mm, [2] commonly to 90 mm. Like other species in the same genus, Strombus pugilis has a robust, somewhat heavy and solid shell, with a characteristic stromboid notch.
The large bone which forms the upper posterior part of the operculum. operculum The bony flap that covers the gills. opercular Pertaining to the operculum. opercular spine A spine projecting from the operculum. orbit The eye socket. origin The most anterior point of a fin base. osseous Bony. ovate Egg-shaped.
The gill arches of bony fish typically have no septum, so that the gills alone project from the arch, supported by individual gill rays. Some species retain gill rakers. Though all but the most primitive bony fish lack a spiracle, the pseudobranch associated with it often remains, being located at the base of the operculum. This is, however ...
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