from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Biology Comblike.
- adj. Biology Having marginal projections that resemble the teeth of a comb: a ctenoid fish.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Having a toothed margin, usually fish scales
- adj. Comb-like in shape.
- n. A ctenoidean.
from the GNU version of the Collaborative International Dictionary of English
- adj. Having a comblike margin, as a ctenoid scale.
- adj. Pertaining to the Ctenoidei.
from The Century Dictionary and Cyclopedia
- Comb-like; pectinate: specifically applied— to a form of scales in fishes in which the posterior margin is pectinated, or beset with small spinules (see cut under scale);
- to a form of dentition in fishes in which the teeth have comb-like ridges.
- Pertaining to the Ctenoidei; having ctenoid scales, as a fish.
- n. A fish with ctenoid scales; one of the Ctenoidei.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. resembling a comb; having projections like the teeth of a comb
Pirate perch is a stout, dark-colored fish, with a single dorsal fin and ctenoid scales on the head and body.
I tried to follow Agassiz's scheme of division into the order of ctenoids and ganoids, with the result that I found one of my species of side-swimmers had cycloid scales on one side and ctenoid on the other.
So long as the strongly-armed ganoidal order prevailed in nature, the sharks were furnished with massive crushing teeth; but when the ganoids waned in creation, and the soft-scaled cycloid and ctenoid orders took and amply filled the place which they had left vacant, the well known modern form of sharks 'teeth was introduced, -- a form much rather suited for cutting soft bodies than for crushing hard ones.
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.
The distinction between the ctenoid scale types, therefore, is primarily based upon their form.
Cycloid Fish Scale - The primary types of fish scales include placoid, cosmoid, ganoid, ctenoid, and cycloid scales.
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.
Basic ctenoid scales, on the other hand, exhibit ctenii, which are formed as separate bony growths distinct from the main body of the scale.
Thin, translucent, and lacking enamel as well as dentine, these modern structures are known as cycloid and ctenoid scales.