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Ctenoid Fish Scale - Three general types of ctenoid scales have been categorized, but each type is composed of two key sections; a rigid surface layer chiefly consisting of crystallized calcium salts and a deeper layer that is formed by collagen-type fibrils.
Cycloid Fish Scale - The primary types of fish scales include placoid, cosmoid, ganoid, ctenoid, and cycloid scales.
The distinction between the ctenoid scale types, therefore, is primarily based upon their form.
Another kind of scale is the ctenoid which are thin flexible scales where the posterior end has comb-like teeth, and are believed to reduce drag on the fish when swimming in the water.— CreationWiki - Recent changes [en]
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