Biodiversity & Conservation

MarLIN Glossary

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Operculum
1) In Gastropoda a horny plate, sometimes strengthened with calcareous material, carried on the foot of gastropods that closes the shell aperture when the animal retracts into its shell (Graham, 1988). 2) In unstalked barnacles, the moveable lid-like structure used to close the aperture (Stachowitsch, 1992). 3) In Bryozoa a generally uncalcified, hinged or pivoted flap or lid-like structure, which closes the orifice through which the feeding tentacles are extended and retracted. 4)In fish, the cover over the gill-slits.

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Glossary references