- vitrodentine
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the enamel-like substance covering the surface of cosmoid scales
Dictionary of ichthyology. 2009.
vitrodentine
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Fish scale — For other uses, see Fish scale (disambiguation). The cycloid scales of a common roach (Rutilus rutilus). The row of lateral line scales is visible in the lower half of the image. The skin of most bony and cartilaginous fishes are covered by… … Wikipedia
cosmoid scale — scale with four layers, an outer, thin, porous layer of vitrodentine (sometimes denticulate or lacking denticles, adenticulate), a middle layer of dentine with pulp cavities or canals (cosmine), a spongy deeper layer of loose spongy bone… … Dictionary of ichthyology
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
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
rostral teeth — tooth like projections on the sides of the snout of Pristidae and Pristiophoridae. They lack a basal plate typical of other elasmobranch teeth and are made of orthodentine and vitrodentine with a pulp cavity filled with osteodentine … Dictionary of ichthyology
chondrichthian — /kon drik thee euhn/, n. any member of the class Chondrichthyes, comprising the cartilaginous fishes. [ < NL, equiv. to chondr CHONDR + Gk ichthýes (pl.) fish] * * * ▪ fish class Introduction class name Chondrichthyes, or Selachii any… … Universalium
fish — fishless, adj. /fish/, n., pl. (esp. collectively) fish, (esp. referring to two or more kinds or species) fishes, v. n. 1. any of various cold blooded, aquatic vertebrates, having gills, commonly fins, and typically an elongated body covered with … Universalium
Fish — /fish/, n. Hamilton, 1808 93, U.S. statesman: secretary of state 1869 77. * * * I Any of more than 24,000 species of cold blooded vertebrates found worldwide in fresh and salt water. Living species range from the primitive lampreys and hagfishes… … Universalium
dentine — ▪ anatomy also spelled Dentin, in anatomy, the yellowish tissue that makes up the bulk of all teeth. It is harder than bone but softer than enamel and consists mainly of apatite crystals of calcium and phosphate. In humans, other mammals … Universalium
DENTS — Situées à l’entrée du tube digestif, les dents constituent des organes très particuliers et hautement différenciés, tant par leur structure histologique très spéciale que par leurs remarquables propriétés mécaniques et physiologiques. En effet,… … Encyclopédie Universelle
