dermal denticle
a small, tooth-like, dermal scale in the skin of Elasmobranchii (except Torpedinidae) and the claspers of Holocephali. Also called more commonly placoid scale, although dermal denticle is more correct anatomically

Dictionary of ichthyology. 2009.

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  • Dermal denticle — Denticles are body surface structures found on some fish and insects.Denticles or placoid scales are small outgrowths which cover the skin of many cartilaginous fish including sharks. They are similar in structure to teeth, and teeth may have… …   Wikipedia

  • denticle — a small tooth like body; also used for the placoid scale of Elasmobranchii. Also called dermal denticle …   Dictionary of ichthyology

  • Denticle — A denticle is a small tooth like structure. It may refer to: Dermal denticles or placoid scales, in cartilaginous fishes Pulp stone or endolith, a calcified mass in the center of a tooth Small structures on the surface of an insect This… …   Wikipedia

  • placoid scale — a type of scale, typically thorn shaped, found on the skin of Elasmobranchii and claspers of Holocephali. Consists of a spine and a basal plate which is usually rhomboidal. It contains a pulp cavity and is composed of an inner layer of dermal… …   Dictionary of ichthyology

  • Shark — Taxobox name = Shark fossil range = Late Devonian Recent image width = 250px image caption = Grey reef shark, Carcharhinus amblyrhynchos regnum = Animalia phylum = Chordata subphylum = Vertebrata classis = Chondrichthyes subclassis =… …   Wikipedia

  • Odontode — Odontodes, or dermal teeth, are hard structures found on the external surfaces of animals or near internal openings. They comprise a soft pulp surrounded by dentine and covered by a mineralized substance such as enamel, a structure similar to… …   Wikipedia

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  • odontoid — placoid scale (a type of scale, typically thorn shaped, found on the skin of Elasmobranchii and claspers of Holocephali. Consists of a spine and a basal plate which is usually rhomboidal. It contains a pulp cavity and is composed of an inner… …   Dictionary of ichthyology

  • Outline of sharks — A great white shark at Isla Guadalupe, Mexico Sharks (superorder Selachimorpha) are a type of fish with a full cartilaginous skeleton and a highly streamlined body. The earliest known sharks date from more than 420 million years ago, before the… …   Wikipedia

  • Filter feeder — [ left|thumb|200px|Krill feeding under high phytoplankton concentration (slowed down by a factor of 12).] Filter feeders (also known as suspension feeders) are animals that feed by straining suspended matter and food particles from water,… …   Wikipedia

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