Enameloid
Enameloid, also known as durodentine or vitrodentine, is an enamel-like tissue found in fish. It is the primary outer component of shark odontodes (teeth and dermal denticles),[1][2][3] and modified forms of enameloid also occur in the teeth and scales of actinopterygian (ray finned) fishes and stem-group gnathostomes (jawed vertebrates).[3] In extinct, armored jawless vertebrates such as heterostracans, enameloid forms the outer component of shell-like dermal armor.[3][4] Although the origin of enameloid is debated, it is probably homologous to dentine rather than true enamel, despite its enamel-like strength and development. The term covers any hyper-mineralized tissue with an organic "scaffold" consisting of ectodermal and ectomesenchymal proteins.[1][2][5]
References
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