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The Homology and Phylogeny of Chondrichthyan Tooth Enameloid by J. Andrew Gillis; Philip C.J. Donoghue is a Environmental Science article available to read on EtoBox.

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## Abstract A systematic SEM survey of tooth microstructure in (primarily) fossil taxa spanning chondrichthyan phylogeny demonstrates the presence of a superficial cap of single crystallite enameloid (SCE) on the teeth of several basal elasmobranchs, as well as on the tooth plates of __Helodus__ (a basal holocephalan). This suggests that the epithelial–mesenchymal interactions required for the development of enameloid during odontogenesis are plesiomorphic in chondrichthyans, and most likely in toothed gnathostomes, and provides phylogenetic support for the homology of chondrichthyan and actinopterygian enameloid. Along the neoselachian stem, we see a crownward progression, possibly modulated by heterochrony, from a monolayer of SCE lacking microstructural differentiation to the complex triple‐layered tooth enameloid fabric of neoselachians. Finally, the occurrence of fully‐differentiated neoselachian enameloid microstructure (including compression‐resistant tangle fibered enameloid and bending‐resistant parallel fibered enameloid) in __Chlamydoselachus anguineus__, a basal Squalean with teeth that are functionally “cladodont,” is evidence that triple‐layered enameloid microstructu

Who reads The Homology and Phylogeny of Chondrichthyan Tooth Enameloid?

Author

J. Andrew Gillis; Philip C.J. Donoghue

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 0362-2525)

Published

2006

Language

EN

Field

Environmental Science (Physical Sciences)