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The stem osteichthyan Andreolepis and the origin of tooth replacement.(Report)

Chen, Donglei ; Blom, Henning ; Sanchez, Sophie ; Tafforeau, Paul ; Ahlberg, Per E.

Nature, Nov 10, 2016, Vol.539(7628), p.237 [Periódico revisado por pares]

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  • Título:
    The stem osteichthyan Andreolepis and the origin of tooth replacement.(Report)
  • Autor: Chen, Donglei ; Blom, Henning ; Sanchez, Sophie ; Tafforeau, Paul ; Ahlberg, Per E.
  • Assuntos: Teeth – Physiological Aspects ; Teeth – Natural History ; Bony Fishes – Physiological Aspects ; Bony Fishes – Natural History
  • É parte de: Nature, Nov 10, 2016, Vol.539(7628), p.237
  • Descrição: 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.
  • Idioma: Inglês

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