A covering/forming a covering. For female Janiroidean asellotan isopods the operculum equates to a plate over the branchial chamber of the abdomen consisting of the fused second pleopods (the first pleopods are absent in these isopods).
A generally uncalcified lamina (or flap), hinged, or pivoting on condyles, which closes the zooidal orifice in Cheilostomata (Hayward & Ryland, 1979). Calcified opercula are found in some cheilostomes, and also in the cyclostome Family Eleidae .
(1) the lid of a moss capsule. (2) the hard bony flap covering the gills of fishes. (3) the plate of exoskeletal material on the foot of a gastropod mollusk with which it closes off the entrance to the shell.
In gastropods, this is a trapdoor or lid to seal the opening in the shell to protect their soft bodies from predators and drying out. The trapdoor is usually attached to the gastropod's foot. On the right is a series of diagrams showing how a snail uses its operculum to seal the shell opening.
a hinged cap on a sporangium. Note: The operculum can also completely detach from the sporangium and float away, so not all opercula remain hinged. This is the main reason why you have to watch zoospore discharge so you can see if an operculum is present or not.
(oh - perk - yoo - lum) In Horseshoe crabs, it is the first of six pairs of gill books. Serves as a cover for the other five pairs. Houses the opening of the genital pores through which eggs and sperm are released from the body.
A lid or flap of skin covering an opening. Examples are the flap of skin covering the gills of some fish and the hard calcite cover of the snail shell opening when the snail is drawn up inside the shell.
The operculum is part of many shelled animals - it is the calcified, disc-shaped "trap door" that opens and closes to protect the animal inside its shell. The operculum from a species of sea snail called the Turban Shell (Turbo petholatus, found in the South Seas north of Australia) is eye-like with a natural cabochon shape and is used in jewelry. This jewelry was popular in Victorian Era Britain. Operculum is also called Pacific Cat's-eye.
The operculum is partly in the most posterior portion of the inferior frontal gyrus of the frontal lobe in the brain. One famous part of the operculum is Broca's area which plays an important role in conversation or speech production, reading and writing.
The operculum (plural : opercula or operculums) of gastropods is a corneous plate at the opening of the shell, attached dorsally to the foot. This fingernail-like structure seals the aperture, serving as a cover against predators when the snail body is retracted. It also enables the snail to survive periods of drought.
The operculum of a bony fish is the hard bony flap covering and protecting the gills. In most fish, the rear edge of the operculum roughly marks the division between the head and the body. The operculum is composed of four bones; the opercle, preopercle, interopercle, and subopercle.
The operculum is a smooth and featherless patch of skin located where the beak attaches to the forehead of certain birds. It is often enlarged and brightly colored such as one can observe in pigeons, parrots and birds of prey. It is also called the cere.