The stem osteichthyan Andreolepis and the origin of tooth replacement

Chen, Donglei (author): Uppsala universitet,Evolution och utvecklingsbiologi

Blom, Henning (author): Uppsala universitet,Evolution och utvecklingsbiologi

Sanchez, Sophie (author): Uppsala universitet,Evolution och utvecklingsbiologi,Science for Life Laboratory, SciLifeLab,European Synchrotron Radiat Facil, 6 Rue Jules Horowitz, F-38043 Grenoble, France.

Tafforeau, Paul (author): European Synchrotron Radiat Facil, 6 Rue Jules Horowitz, F-38043 Grenoble, France.

Ahlberg, Per (author): Uppsala universitet,Evolution och utvecklingsbiologi,Science for Life Laboratory, SciLifeLab

(creator_code:org_t)

2016-10-17
2016
English.
In: Nature. - : Springer Science and Business Media LLC. - 0028-0836 .- 1476-4687. ; 539:7628, s. 237-

Related links:: https://urn.kb.se/re...; show more...; https://doi.org/10.1...; show less...

Abstract Subject headings

The teeth of gnathostomes (jawed vertebrates) show rigidly patterned, unidirectional replacement that may or may not be associated with a shedding mechanism. These mechanisms, which are critical for the maintenance of the dentition, are incongruently distributed among extant gnathostomes. Although a permanent tooth-generating dental lamina is present in all chondrichthyans, many tetrapods and some teleosts, it is absent in the non-teleost actinopterygians. Tooth-shedding by basal hard tissue resorption occurs in most osteichthyans (including tetrapods) but not in chondrichthyans. Here we report a three-dimensional virtual dissection of the dentition of a 424-million-year-old stem osteichthyan, Andreolepis hedei, using propagation phase-contrast synchrotron microtomography, with a reconstruction of its growth history. Andreolepis, close to the common ancestor of all extant osteichthyans, shed its teeth by basal resorption but probably lacked a permanent dental lamina. This is the earliest documented instance of resorptive tooth shedding and may represent the primitive osteichthyan mode of tooth replacement.

By the author/editor: Chen, Donglei; Blom, Henning; Sanchez, Sophie; Tafforeau, Paul; Ahlberg, Per

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Biological Scien ...; and Evolutionary Bio ...

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