Share This Author
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…
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.
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.
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.
Phylogeny of Paleozoic limbed vertebrates reassessed through revision and expansion of the largest published relevant data matrix
Even in its revised state, the matrix cannot provide a robust assessment of the phylogeny of early limbed vertebrates, and approaches to coding, methods of phylogenetics, and prospects for further improvement are discussed.
Apsisaurus witteri from the Lower Permian of Texas: Yet Another Small Varanopid Synapsid, Not a Diapsid
Paleozoic varanopid synapsids and diapsids, rare members of the terrestrial fossil assemblages, are not closely related to each other but appear to have acquired a number of interesting similarities…
The Origin(s) of Modern Amphibians: A Commentary
Anderson (2008) argues that the LH is mainly supported by loss char-acters, and that this is problematic ‘’given the relative easethat these losses can arise via paedomorphosis, which appears to evolve repeatedly’’, and emphasizes develop-ment characters such as digit development and skull ossi-ﬁcation order, which are known to be homoplastic.
Reassessment of historic ‘microsaurs’ from Joggins, Nova Scotia, reveals hidden diversity in the earliest amniote ecosystem
‘Microsaurs’ are traditionally considered to be lepospondyl non‐amniotes, but recent analyses have recovered a subset of ‘microsaurs’, the fossorially adapted Recumbirostra, within Amniota. This…
Assessing Confidence Intervals for Stratigraphic Ranges of Higher Taxa: The Case of Lissamphibia
The results suggest a more recent origin of Lissamphibia than advocated in most recent molecular studies, and are more compatible with monophyly than with polyphyly of the extant amphibians, but heavily depend on poorly constrained assumptions about lissamp Hibian extinction rates during biological crises.
An Extremely Peramorphic Newt (Urodela: Salamandridae: Pleurodelini) from the Latest Oligocene of Germany, and a New Phylogenetic Analysis of Extant and Extinct Salamandrids
An Oligocene newt specimen from western Germany that has gone practically unnoticed in the literature despite having been housed in the Museum für Naturkunde (Berlin) for a century is described and neontologists working on salamandrids are urged to pay renewed attention to the skeleton, not limited to the skull, as a source of diagnostic and phylogenetically informative characters.