Enameloid, also known as durodentine or vitrodentine, is an enamel-like tissue found in fish. It is the primary outer component of sharkodontodes (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 ectomesenchymalproteins.[1][2][5]
^ abGillis, J.; Donoghue, P. (2007). "The homology and phylogeny of chondrichthyan tooth enameloid". Journal of Morphology. 268 (1): 33–49. doi:10.1002/jmor.10501. PMID17146771.
