operculum

/oh-pur-kyuh-luhm/US // oʊˈpɜr kyə ləm //UK // (əʊˈpɜːkjʊləm) //

厣,厣的作用,厣的,厣的位置

Definitions

n.名词 noun

1
plural o·per·cu·la [oh-pur-kyuh-luh], /oʊˈpɜr kyə lə/, o·per·cu·lums.
- : Botany, Zoology. a part or organ serving as a lid or cover, as a covering flap on a seed vessel.
- : Zoology. the gill cover of fishes and amphibians. a horny plate that closes the opening of the shell when the animal is retracted.

Operculum semi-lunar, orange, with a projection which serves as a lock to keep the operculum in position.
Operculum made of plates rising one above another formed at different stages of growth.
The operculum, like the shell itself, often exhibits distinct lines of growth which display the manner in which it was built up.
These fishes generally have an air-bladder, and the gills lie close together in a cavity covered by an operculum.
These are the bones connected with respiration—the operculum, the branchiostegal rays, the branchial arches, and others.