Examples from the Web for ctenoid
Louis Agassiz distinguished four kinds of scales—placoid, ganoid, cycloid and ctenoid.Zoology: The Science of Animal Life|Ernest Ingersoll
In general, prickly points on the skin are modifications of ctenoid scales.
The distinctions between cycloid and ctenoid scales, between placoid and ganoid fishes, are vague, and can hardly be maintained.
Ctenoid scales have a comb-edge of fine prickles or cilia; cycloid scales have the edges smooth.
There are two principal types of Teleostean scales, the cycloid and ctenoid.The Vertebrate Skeleton|Sidney H. Reynolds