Ontogenetic evidence for the Paleozoic ancestry of salamanders

Evolution & Development
Rainer R Schoch, Robert L Carroll

Abstract

The phylogenetic positions of frogs, salamanders, and caecilians have been difficult to establish. Data matrices based primarily on Paleozoic taxa support a monophyletic origin of all Lissamphibia but have resulted in widely divergent hypotheses of the nature of their common ancestor. Analysis that concentrates on the character states of the stem taxa of the extant orders, in contrast, suggests a polyphyletic origin from divergent Paleozoic clades. Comparison of patterns of larval development in Paleozoic and modern amphibians provides a means to test previous phylogenies based primarily on adult characteristics. This proves to be highly informative in the case of the origin of salamanders. Putative ancestors of salamanders are recognized from the Permo-Carboniferous boundary of Germany on the basis of ontogenetic changes observed in fossil remains of larval growth series. The entire developmental sequence from hatching to metamorphosis is revealed in an assemblage of over 600 specimens from a single locality, all belonging to the genus Apateon. Apateon forms the most speciose genus of the neotenic temnospondyl family Branchiosauridae. The sequence of ossification of individual bones and the changing configuration of the skull ...Continue Reading

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Citations

Nov 17, 2009·Seminars in Cell & Developmental Biology·Nadia B FröbischFlorian Witzmann
Nov 26, 2008·Journal of Experimental Zoology. Part B, Molecular and Developmental Evolution·Catherine Anne Boisvert
Oct 25, 2008·Biological Reviews of the Cambridge Philosophical Society·Nadia B Fröbisch
Aug 26, 2006·Evolution; International Journal of Organic Evolution·Rainer R Schoch, Nadia B Fröbisch
Feb 23, 2007·Biological Reviews of the Cambridge Philosophical Society·Tiphaine Davit-BéalJean-Yves Sire
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Jun 9, 2010·Systematic Biology·Nadia B Fröbisch, Rainer R Schoch
May 24, 2007·Systematic Biology·David Marjanović, Michel Laurin
May 16, 2006·Molecular Phylogenetics and Evolution·Michael S Y Lee, Jason S Anderson

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