ctenoid scale

(from the article `scale`) ...but are covered with a peculiar enamel-like substance called ganoin. It is thought that true teeth developed from placoid scales. The advanced ... ...inner layer of ganoid or cosmoid scales. Found in carps and similar fishes, they are thin, large, round or oval, and arranged in an overlapping ... [2 rela...
Found on http://www.britannica.com/eb/a-z/c/165
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