EntityQ1480851· pop 18· linked from 2,755 articlesoperculumSign in to savehard structure which closes the aperture of a gastropod when the animal retreats into the shellConnectionsGastropodaEntityJapanCountryChinaCountryLondonCitywaterEntityLatinEntityOceaniaEntityfishEntityMiddle EastConceptRed SeaEntityJewish peopleEntityExodusEntityArabian PeninsulaEntityethanolEntitypearlEntityvinegarEntitysnailEntityperfumeEntitydigital object identifierEntitygemstoneEntityCategoriesGastropod anatomyIncense materialMollusc productsOrganic gemstones