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 (Meri
stomata, Arthropoda). 3. The cover of the aperature of a snail
shell (Gastropoda, Mollusca).
Full article >>>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.
Full article >>>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.
Full article >>>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.
Full article >>>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.
Full article >>>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.
Full article >>>'"/>