Origin of ganoid
Examples from the Web for ganoid
Louis Agassiz distinguished four kinds of scales—placoid, ganoid, cycloid and ctenoid.Zoology: The Science of Animal Life|Ernest Ingersoll
The distinctions between cycloid and ctenoid scales, between placoid and ganoid fishes, are vague, and can hardly be maintained.
Dura Den, a glen near Cupar-Fife, famous for the number of ganoid fossil fishes entombed in its sandstone.The Nuttall Encyclopaedia|Edited by Rev. James Wood
They are not, however, relatively so large as in other Ganoid forms, more especially the Chondrostei and Polypterus.The Works of Francis Maitland Balfour, Volume 1|Francis Maitland Balfour
Another American ganoid is Amia calva, the dog-fish or bow-fin, which is very numerous in Western rivers.