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. 2016 Nov 30;3(11):160385. doi: 10.1098/rsos.160385

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© 2016 The Authors.

Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.

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Figure 7. — Tooth formation in heterodont squaliforms and Pristiophorus. All images rendered micro-CT data. Scale bars all 10 mm. (a–f) Renders of a 26 cm embryo of Centroscymnus coelolepis. (a) General view of ventral side of head. (b) General view of ventral side of head with greater penetration. (c) Lingual view of dentition. (d) Detail of lingual view of lower dentition. (e) Occlusal view of lower dentition showing the first-formed tooth row. (f) Occlusal view of upper dentition. (g) Lingual view of the dentition of a 10 cm embryo of Etmopterus spinax; the mineralized tips of the upper teeth (yellow) and lower teeth (blue) can be seen. (h) Lingual view of the dentition of a 16 cm juvenile of Etmopterus spinax. (i) Lingual view of the dentition of an adult of Etmopterus spinax. (j–n) Renders of an embryo of Pristiophorus cirratus; Australia. (j) General view of ventral side of head. (k) Occlusal view of upper dentition. (l) Occlusal view of lower dentition. (m) Lower dentition colour coded to show alternate dental pattern. (n) Lower dentition colour coded to show oblique rows, in this case not forming functional ‘blades’ as in squaliforms.