cosmoid scale

views updated May 08 2018

cosmoid scale Type of scale found only in fossil lung-fish (Dipnoi), and in Crossopterygii, including the living coelacanth. The thick scales are composed of layers of vitrodentine (harder than dentine and containing little organic matter), followed by cosmine (a type of dentine perforated by branching canals), and finally by layers of vascular and laminated bone underneath.

A Dictionary of Earth Sciences AILSA ALLABY and MICHAEL ALLABY

cosmoid scale

views updated Jun 11 2018

cosmoid scale A type of scale found only in fossil lungfish (Dipneusti), and in Crossopterygii, including the living coelacanth. The thick scales are composed of layers of vitrodentine, followed by cosmine, and finally by layers of vascular and laminated bone underneath.

A Dictionary of Zoology MICHAEL ALLABY

cosmoid scale

views updated May 29 2018

cosmoid scale See scales.

A Dictionary of Biology

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