Initial diversification of living amphibians predated the breakup of Pangaea

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2005
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San Mauro, Diego
Vences, Miguel
Alcobendas, Marina
Zardoya, Rafael
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The American Naturalist. 2005, 165(5), pp. 590-599. ISSN 0003-0147. eISSN 1537-5323. Available under: doi: 10.1086/429523
Zusammenfassung

The origin and divergence of the three living orders of amphibians (Anura, Caudata, Gymnophiona) and their main lineages are one of the most hotly debated topics in vertebrate evolution. Here, we present a robust molecular phylogeny based on the nuclear RAG1 gene as well as results from a variety of alternative independent molecular clock calibrations. Our analyses suggest that the origin and early divergence of the three living amphibian orders dates back to the Palaeozoic or early Mesozoic, before the breakup of Pangaea, and soon after the divergence from lobe-finned fishes. The resulting new biogeographic scenario, age stimate, and the inferred rapid divergence of the three lissamphibian orders may account for the lack of fossils that represent plausible ancestors or immediate sister taxa of all three orders and the heretofore paradoxical distribution of some amphibian fossil taxa. Furthermore, the ancient and rapid radiation of the three lissamphibian orders likely explains why branch lengths connecting their early nodes are particularly short, thus rendering phylogenetic inference of implicated relationships especially difficult.

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Fachgebiet (DDC)
570 Biowissenschaften, Biologie
Schlagwörter
amphibian evolution, Pangaea breakup, molecular phylogeny, molecular clock, multiple calibrations, RAG1
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ISO 690SAN MAURO, Diego, Miguel VENCES, Marina ALCOBENDAS, Rafael ZARDOYA, Axel MEYER, 2005. Initial diversification of living amphibians predated the breakup of Pangaea. In: The American Naturalist. 2005, 165(5), pp. 590-599. ISSN 0003-0147. eISSN 1537-5323. Available under: doi: 10.1086/429523
BibTex
@article{SanMauro2005Initi-7543,
  year={2005},
  doi={10.1086/429523},
  title={Initial diversification of living amphibians predated the breakup of Pangaea},
  number={5},
  volume={165},
  issn={0003-0147},
  journal={The American Naturalist},
  pages={590--599},
  author={San Mauro, Diego and Vences, Miguel and Alcobendas, Marina and Zardoya, Rafael and Meyer, Axel}
}
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