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).
The orbital operculum lies below the anterior horizontal ramus of the fissure, the frontal between this and the anterior ascending ramus, the parietal between the anterior ascending ramus and the upturned end of the posterior ramus, ...
Bony fish (teleosts) have an operculum over their gills and they swallow water and force it over their gills and out the operculum. As we said, frogs swallow air.
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.
Fish anatomy includes a two-chambered 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.
mictic/amictic egg. sporocyst, redia, miracidia. ocelli/statocysts. operculum. osculum/ostia ... amictic cycles of reproduction seen in. Rotifers. a. b. a. c. d. e ...
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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.
 See also: Trans, Life, Animal, Animals, Class
  
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