ganoine


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Noun1.ganoine - shiny substance that resemble enamel and is secreted by the corium of certain fishes (especially ganoid fishes) and composes the outer layer of their scales
secretion - a functionally specialized substance (especially one that is not a waste) released from a gland or cell
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(1986): Apport de l'etude de l'ornementation microscopique de la ganoine dans la determination de l'appartenance generique et/ou specifique des ecailles isolees.
That scale-like protection was not metal, but strong layers of bone covered with enamel-like dentine, compounds called vitrodentine, cosmine or ganoine. Why did they need such strong or large scales?
Scales are built from several generations of ridges; ridges consist of orthodentine and are covered by thin single-layered ganoine; bases of ridges of all generations and the base of the whole scale are built from cellular bone; the scales between the base and uppermost dentine layer are spongious.
scorpius are rather similar in size to those of these other actinopterygians but the underlying tissue is different, as the teleost scales consist of laminated bone, while the polypteriform and lepisosteiform fishes have ganoid scales with hard, multilayered, enamel-like ganoine in their upper part.