KnowraOperculumLinked fromLinked fromThe 19 pages that link to Operculum, each with the reason it gives.All 19Broader topic 4Related 12Compared with 3SpiracleCompared with: Unlike the spiracle, the operculum covers the gills and helps drive water out.Ram ventilationCompared with: Opercular movement can pump water over gills without continuous forward swimming.Land snailCompared with: Some land snails use one to seal the shell during dormancy or dry conditions.