The Origin(s) of Modern Amphibians: A Commentary

  title={The Origin(s) of Modern Amphibians: A Commentary},
  author={David Marjanovi{\'c} and Michel Laurin},
  journal={Evolutionary Biology},
Anderson(2008)recentlyreviewedthecontroversialtopicofextant amphibian origins, on which three (groups of)hypotheses exist at the moment. Anderson favors the‘‘polyphyly hypothesis’’ (PH), which considers the extantamphibians to be polyphyletic with respect to many Paleo-zoic limbed vertebrates and was most recently supported bythe analysis of Anderson et al. (2008). Another is the‘‘temnospondyl hypothesis’’ (TH—lissamphibians nestedwithintemnospondyls),mostrecentlysupportedbyRutaandCoates (2007… 

The origin(s) of extant amphibians: a review with emphasis on the “lepospondyl hypothesis”

It is proposed that the complex of characters called the salamander mode of autopodium development is (in its less extreme forms) plesiomorphic for limbed vertebrates, so the apparent presence of this mode of development in temnospondyls cannot support the TH or the PH.

The origin of modern amphibians: a re-evaluation

A matrix based on data from all three hypotheses and analysed key taxa phylogenetically using both Bayesian inference and parsimony supported the temnospondyl hypothesis of lissamphibian origins.

The lower permian dissorophoid «doleserpeton» (temnospondyli), and the evolution of modern amphibians

The origin and evolution of modern amphibians is still a subject of controversy. The amphibamid temnospondyl Doleserpeton has often been suggested as a close relative of modern amphibians, but the

An updated paleontological timetree of lissamphibians, with comments on the anatomy of Jurassic crown-group salamanders (Urodela)

The conclusion that the fossil record of Lissamphibia is dense enough to provide reliable calibration constraints for molecular divergence dating is upheld and some of the divergence dates the authors infer from the tree are up to 15 Ma younger than previously published.

Osmotic tolerance and habitat of early stegocephalians: indirect evidence from parsimony, taphonomy, palaeobiogeography, physiology and morphology

A review of the evidence suggests that several (perhaps most) early stegocephalians tolerated saltwater, even although they also lived in freshwater.

A review of the fossil record of caecilians (Lissamphibia: Gymnophionomorpha) with comments on its use to calibrate molecular timetrees

The caecilian fossil record is revisited, providing a brief description of all known extinct taxa described so far, along with general remarks about their impact on systematics, time range, and geographical distribution of the clade, as well as prospects for future research.

The putative lissamphibian stem-group: phylogeny and evolution of the dissorophoid temnospondyls

  • R. Schoch
  • Biology, Environmental Science
    Journal of Paleontology
  • 2018
An inclusive phylogenetic analysis of dissorophoids gives new insights into the large-scale topology of relationships, including a basal dichotomy between the large, heavily ossified Olsoniformes and the small salamander-like Amphibamiformes.

A Review of the Fossil record of Gymnophiona (Tetrapoda; Lissamphibia) with Comments on Its Use to Calibrate Molecular Timetrees

Gymnophiona, the most poorly known group of extant amphibians, includes elongated limbless tetrapods, with compact ossified skulls and reduced eyes, mainly adapted to fossorial life (only the

A multilocus timescale for the origin of extant amphibians.

New Information on Amphibamids (Tetrapoda, Temnospondyli) from Richards Spur (Fort Sill), Oklahoma

ABSTRACT A nearly complete amphibamid skull from the Richards Spur locality in Oklahoma is demonstrated to be a new species of Tersomius. This new species has a mosaic of features seen in other



A reevaluation of the evidence supporting an unorthodox hypothesis on the origin of extant amphibians

The most parsimonious trees - now longer by almost 64% - support one of the three commonly advocated hypotheses, namely a monophyletic Lissamphibia nested, together with its sister-group Albanerpetontidae, within the temnospondyls (next to Doleserpeton) - even though the authors did not add any characters or taxa to the very small data matrix.

Focal Review: The Origin(s) of Modern Amphibians

The present paper reviews the impact of this fossil on morphological and molecular phylogenies, and divergence timing estimates based on molecular models and the fossil record, and raises questions over either the validity of morphological analyses that support lissamphibian polyphyly or about the possibility of long branch attraction given the short internal divergences and long subsequent branches.

A stem batrachian from the Early Permian of Texas and the origin of frogs and salamanders

The discovery of an amphibamid temnospondyl from the Early Permian of Texas that bridges the gap between other Palaeozoic amphibians and the earliest known salientians and caudatans from the Mesozoic is reported.

Dates, nodes and character conflict: Addressing the Lissamphibian origin problem

Tests of different crown topologies show that placement of amphibians within lepospondyls is not a significantly worse fit for the whole character set than a close temnospondyl‐lissamphibian relationship, and the latter phylogenetic hypothesis best captures the most coherent assembly of derived lissampshibian apomorphies.


An anatomical study of Microbrachis reveals inaccuracies in previous studies, especially in the palate and cranial proportions, which corroborates previous suggestions that lissamphibians are part of a clade that includes the taxa classically referred to as “lepospondyls,” and that seymouriamorphs and temnospONDyls are not part of Tetrapoda.

The Carboniferous Amphibian Tuditanus [ Eosauravus ] and the Distinction Between Microsaurs and Reptiles BY

The ancestry of reptiles has been subject to considerable dispute in recent years. One of the major problems involves the possibility that microsaurian amphibians may have given rise to some, if not


  • R. SchochN. Fröbisch
  • Geography, Environmental Science
    Evolution; international journal of organic evolution
  • 2006
These specimens give new insight into patterns of metamorphosis (morphological transformation) in branchiosaurids that are believed to be correlated to a change of habitat, and clearly show that different life‐history pathways comparable to those of modern salamanders were already estabilshed in this Paleozoic clade.

Land salamanders of the family Hynobiidae from the Neogene and Quaternary of Europe

A new extinct genus with two new species of land salamanders of the family Hynobiidae, from the Late Miocene of Polgardi (MN13) and from the Lower Pleistocene of Betfia IX/C (MQ1), Romania, is described.

Fossils, molecules, divergence times, and the origin of lissamphibians.

A review of the paleontological literature shows that the early dates of appearance of Lissamphibia recently inferred from molecular data do not favor an origin of extant amphibians from

Earliest known crown-group salamanders

The discovery of well-preserved Middle Jurassic salamander from China constitutes the earliest known record of crown-group urodeles (living salamanders and their closest relatives) and provides evidence to support the hypothesis that the divergence of the Cryptobranchidae from the Hynobiidae had taken place in Asia before the Middle Jurassic period.