what is placoid scales,,,,,,
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Placoid scales (or denticles) are spiny, toothlike projections seen only in cartilaginous fishes. Ganoid scales, sometimes considered a modification of the placoid type, are chiefly bony but are covered with an enamel-like substance called ganoin.
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Placoid scales (or denticles) are spiny, toothlike projections seen only in cartilaginous fishes.
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