Abstract
The function of placoid scales (dermal denticles) is considered along three perspectives.
Firstly, in a historical context, denticles have been modified along several functional lines,
including protection from predators and ectoparasites, reduction of mechanical abrasion,
accommodation of bioluminescent and sensory organs, and reduction of frictional drag.
Each function selects for a unique morphology described herein. Secondly, denticles
characteristic of benthic and/or sedentary sharks are re-examined through an analysis of
15 genera. Generalizations are difficult due to the wide range of variation in crown
morphology and overall scale weight, but individual denticle types do reflect combined
optimal characteristics for both hydrodynamics and protection, tending toward the latter.
Lastly, the relationship between slight variations in regional flow dynamics over the body,
and the potential impact of this relationship on the previously defined hydrodynamic scale
characteristics, is examined in two pelagic carcharhinids. These findings suggest that
along the anterior portion of the body, strong indications of reduced ridge dimensions
(heights and spacings) on the dorsum are present and may be related to water velocity.
Subject
Ecology,Aquatic Science,Ecology, Evolution, Behavior and Systematics,Oceanography
Cited by
109 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献