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  2. Operculum (fish) - Wikipedia

    en.wikipedia.org/wiki/Operculum_(fish)

    Opercular series in bony fish: operculum (yellow), preoperculum (red), interoperculum (green) and suboperculum (pink) The operculum is a series of bones found in bony fish and chimaeras that serves as a facial support structure and a protective covering for the gills ; it is also used for respiration and feeding.

  3. Operculum (animal) - Wikipedia

    en.wikipedia.org/wiki/Operculum_(animal)

    The operculum lies on the top rear part of the foot. When the foot is retracted, the operculum is rotated 180° and closes the shell. [2] An operculum (fish), a flap that covers the gills in bony fishes and chimaeras. The cover that rapidly opens a cnida of a cnidarian such as a jellyfish or a sea anemone. The lid may be a single hinged flap or ...

  4. Turbinidae - Wikipedia

    en.wikipedia.org/wiki/Turbinidae

    Turbinidae have a strong, thick calcareous operculum readily distinguishing them from the somewhat similar Trochidae or top snails, which have a corneous operculum. This strong operculum serves as a passive defensive structure against predators that try to enter by way of the aperture or that would break the shell at the outer lip.

  5. Ostracoderm - Wikipedia

    en.wikipedia.org/wiki/Ostracoderm

    After the appearance of jawed fish (placoderms, acanthodians, sharks, etc.) about 420 million years ago, most ostracoderm species underwent a decline, and the last ostracoderms became extinct at the end of the Devonian period. More recent research indicates that fish with jaws had far less to do with the extinction of the ostracoderms than ...

  6. Cleithrum - Wikipedia

    en.wikipedia.org/wiki/Cleithrum

    In modern fishes, the cleithrum is a large bone that extends upwards from the base of the pectoral fin and anchors to the cranium above the gills, forming the posterior edge of the gill chamber. [2] The bone has scientific use as a means to determine the age of fishes. The lobe-finned fishes share this arrangement.

  7. Fish gill - Wikipedia

    en.wikipedia.org/wiki/Fish_gill

    The gill arches of bony fish typically have no septum, so that the gills alone project from the arch, supported by individual gill rays. Some species retain gill rakers. Though all but the most primitive bony fish lack a spiracle, the pseudobranch associated with it often remains, being located at the base of the operculum. This is, however ...

  8. Strombus pugilis - Wikipedia

    en.wikipedia.org/wiki/Strombus_pugilis

    Apertural view of a live but retracted Strombus pugilis out of water in a human hand showing the brown operculum. The maximum recorded shell length is 110 mm [1] or up to 130 mm, [2] commonly to 90 mm. Like other species in the same genus, Strombus pugilis has a robust, somewhat heavy and solid shell, with a characteristic stromboid notch.

  9. Turbo petholatus - Wikipedia

    en.wikipedia.org/wiki/Turbo_petholatus

    The circular operculum contains four whorls and a nucleus placed one-third the distance across the face. The outer surface is convex, shining, bright green on the center, the margins brown on one side, white upon the other, slightly granulose about the edges. [2] Drawing of a shell of Turbo petholatus