The stem osteichthyan Andreolepis and the origin of tooth replacement
2016 (English)In: Nature, ISSN 0028-0836, E-ISSN 1476-4687, Vol. 539, no 7628, 237-+ p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2016. Vol. 539, no 7628, 237-+ p.
IdentifiersURN: urn:nbn:se:uu:diva-310754DOI: 10.1038/nature19812ISI: 000387318500034PubMedID: 27750278OAI: oai:DiVA.org:uu-310754DiVA: diva2:1058039
FunderEU, European Research Council, 233111Knut and Alice Wallenberg Foundation