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ganoine
Ganoine or ''ganoin'' is a glassy, often multi-layered mineralized tissue that covers the scales, cranial bones and fin rays in some basal ray-finned fishes. It is composed of rod-like, pseudoprismatic apatite crystallites, with less than 5% of organic matter. Existing fish groups featuring ganoin are bichirs and gars, but ganoin is also characteristic of several extinct taxa. It is a characteristic component of ganoid scales.
Ganoine is an ancient feature of ray-finned fishes, being found for example on the scales of stem group actinopteryigian ''Cheirolepis''.〔 While often considered a synapomorphic character of ray-finned fishes, ganoine or ganoine-like tissues are also found on the extinct acanthodii.〔
It has been suggested that ganoine is homologous to tooth enamel in vertebrates〔 or even considered a type of enamel.〔 Ganoine indeed contains amelogenin-like proteins〔 and has a mineral content similar to that of tetrapod tooth enamel.
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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