gill raker

gill raker
one of a series of variously shaped bony or cartilaginous projections on the inner side of the branchial arch. The rakers have epithelial denticles and both their gross and fine structure serves to retain food particles in the mouth. The gill raker count normally includes all rakers, even the rudiments, and is made on the front half of the first arch. Upper and lower gill raker counts may be presented as the upper and the lower (including the central raker), e.g. 9 + 17; or as upper rakers, central raker, and lower rakers, e.g. 9 + 1 + 16. The most anterior and posterior rakers are often small and delicate, easily torn or lost if the arch is removed. Plankton feeders have numerous, crowded, elongate and fine rakers while predators have few, separated, short and stubby rakers

Dictionary of ichthyology. 2009.

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  • gill raker — noun also gill rake Etymology: gill (III) : one of the bony processes on the inside of the branchial arches of fishes that help to prevent solid substances from being carried out through the branchial clefts * * * /gil/ (in fish) one of a series… …   Useful english dictionary

  • gill raker — noun Date: 1880 any of the bony processes on a gill arch that divert solid substances away from the gills …   New Collegiate Dictionary

  • gill raker — noun A bony, finger like projection of the gill arch filaments of fish, used for food retention in some species …   Wiktionary

  • gill raker sieve — the set of gill rakers on the gill arches acting as a filter or sieve …   Dictionary of ichthyology

  • gill raker — /gil/ (in fish) one of a series of stiff projections along the inner margins of the branchial arches that prevent food particles from passing through the branchial clefts. [1875 80] * * * …   Universalium

  • gill rake — noun see gill raker …   Useful english dictionary

  • Raker — Rak er (r[=a]k [ e]r), n. [See 1st {Rake}.] 1. One who, or that which, rakes; as: (a) A person who uses a rake. (b) A machine for raking grain or hay by horse or other power. (c) A gun so placed as to rake an enemy s ship. [1913 Webster] 2. (Zo[… …   The Collaborative International Dictionary of English

  • micro-gill raker — micro branchiospine …   Dictionary of ichthyology

  • branchiospina — (plural branchiospinae) gill raker (one of a series of variously shaped bony or cartilaginous projections on the inner side of the branchial arch. The rakers have epithelial denticles and both their gross and fine structure serves to retain food… …   Dictionary of ichthyology

  • Centropomus — Temporal range: 55–0 Ma …   Wikipedia

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