denticle


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denticle

[′dent·ə·kəl]
(zoology)
A small tooth or toothlike projection, as the type of scale of certain elasmobranchs.
References in periodicals archive ?
Covering every inch of the big fish's skin are tiny denticles, interlocking scales that bend with the shark's body and decrease drag.
The distal surface of blade smooth, straight, nearly in parallel with border membrane, and higher than the bluntly tangent point; the anterior and posterior margins of blade not very smooth and not parallel with each other; anterior margin of blade not extending beyond y+1 axis; posterior margin of blade L shaped with deep point; apophysis of blade present and posterior projection absent; central part not developed and cone-shaped with sharp point fitting loosely into preceding denticle and not extending half way to y-1 axis; shapes of the central part above and below the X-axis similar; ray connection very inconspicuous and barely distinguishable from ray; ray relatively thin, needle- shaped, obliquely attached and slanted a little posteriorly with a sharp point of ray.
Peristome markedly oblique, more or less in one tangential plane; aperture subcircular to roundly quadrate; columella lip robust, with 2 relatively massive teeth, the upper one slightly more robust, the lower one somewhat narrower and with a small denticle on its lower margin; parietal and umbilical region covered with well-developed, glossy callus which flares outward over base; callus porcelaneous and mostly smooth, but with some beads of unequal size in region adjacent to columella teeth; one particularly strong bead at base of lower columella tooth; edge of callus raised and flaring where it joins flared margin of outer lip.
Denticle structure is also examined with respect to prey type and feeding strategy adopted by each species to gain a better understanding of denticular function.
The genus is readily separated into three groups based on the shape and distribution patterns of dermal denticles (Springer and Burgess 1985; Yano 1988).
The edges of Majungatholus' bladelike teeth, like those of many carnivores, sport denticles.
2012b) from the Campbellton site has yielded fin spines with denticles (Burrow et al.
In Paraphidnia the anterior denticle on the vertex is little developed and the posterior part is sometimes broad and developed as a laterally flattened crest (P.
The triangular head has a single median denticle (1.
radial denticles--reticulin fibers surround the denticle, penetrate its structure and connect with the surrounding tissue,