ganoidei Meaning, Definition & Usage

noun a group of mostly extinct primitive bony fishes characterized by armor-like bony scales
order Ganoidei.

NL. See Ganoid.

(Zoöl.) One of the subclasses of fishes. They have an arterial cone and bulb, spiral intestinal valve, and the optic nerves united by a chiasma. Many of the species are covered with bony plates, or with ganoid scales; others have cycloid scales. ✍ They were numerous, and some of them of large size, in early geological periods; but they are represented by comparatively few living species, most of which inhabit fresh waters, as the bowfin, gar pike, bichir, Ceratodus, paddle fish, and sturgeon.