Operculum

operculum A cover. 1. The cover of a gill chamber of a bony fish (Chordata). 2. The cover of the genital pores of a horseshoe crab (Meristomata, Arthropoda). 3. The cover of the aperature of a snail shell (Gastropoda, Mollusca).
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operculum
(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.
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sealed by an operculum, and
covered with a calyptra. The calyptra develops from the wall of the old archegonium and so is actually a part of the gametophyte generation. It is responsible for the common name ("haircap moss") of this species.
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Fish anatomy includes two chamber heart , operculum, secretory cells that produce mucous, swim bladder, scales, fins, gills, lips and eyes. Fish breathe under water by extracting oxygen from sea water through their gills.
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Fish anatomy includes a two chamber heart, operculum, secretory cells that produce mucous, swim bladder, scales, fins, lips and eyes. Fish breathe by extracting oxygen from water through their gills. Fins propel and stabilize the fish in the water.
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The gills in this group of fish do not open separately and are covered by an operculum. Ray-finned fish have a swim bladder, a gas-filled sac, that regulates buoyancy and depth. Sharks lack this feature, which enables fish to "sleep" without sinking.
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