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A stem batrachian from the Early Permian of Texas and the origin of frogs and salamanders
- Jason S. Anderson, R. Reisz, D. Scott, N. Fröbisch, S. Sumida
- Biology, Environmental ScienceNature
- 22 May 2008
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.
Georgenthalia clavinasica, A New Genus and Species of Dissorophoid Temnospondyl from the Early Permian of Germany, and the Relationships of the Family Amphibamidae
Several features support a highly terrestrial habitus of G. clavinasica, which is consistent with the interpretation of the fossiliferous beds of the Bromacker quarry as representing an upland terrestrial environment in which limnic conditions were characterized by ephemeral lakes and ponds.
A Diverse Tetrapod Fauna at the Base of 'Romer's Gap'
- Jason S. Anderson, T. Smithson, Chris F. Mansky, T. Meyer, J. Clack
- Geography, Environmental SciencePloS one
- 27 April 2015
The fossils from Blue Beach demonstrate that when windows into the fauna of ‘Romer’s Gap’ are found a rich diversity of tetrapods will be shown to be present, contra arguments that suggested this hiatus in the fossil record was due to extrinsic factors such as atmospheric oxygen levels.
REVISION OF THE AÏSTOPOD GENUS PHLEGETHONTIA (TETRAPODA: LEPOSPONDYLI)
- Jason S. Anderson
- BiologyJournal of Paleontology
- 1 November 2002
Details of Cranial anatomy contradict a previous model of cranial kinesis by severely limiting the skull's potential mobility and three species are recognised within the family Phlegethontiidae.
Hidden morphological diversity among early tetrapods
Micro-computed tomography of the only known specimen of Lethiscus is used to provide new information that strongly challenges a consensus that stem group tetrapods were much more diverse in their body plans than previously thought.
Variation in the Skull of Anchiceratops (Dinosauria, Ceratopsidae) from the Horseshoe Canyon Formation (Upper Cretaceous) of Alberta
- Jordan C. Mallon, R. Holmes, D. Eberth, M. Ryan, Jason S. Anderson
- Environmental Science, Geography
- 1 September 2011
All material from the HCF that can be positively attributed to Anchiceratops are described, and no compelling evidence for dimorphism is found, concluding that there is a single, variable species of Anchicatops, A. ornatus.
The Functional and Palaeoecological Implications of Tooth Morphology and Wear for the Megaherbivorous Dinosaurs from the Dinosaur Park Formation (Upper Campanian) of Alberta, Canada
Comparative tooth morphology and wear exhibit different, but complimentary, dietary signals that combine to support the hypothesis of dietary niche partitioning, and indicates that all forms considered here exhibited some degree of masticatory propaliny.
Focal Review: The Origin(s) of Modern Amphibians
- Jason S. Anderson
- Biology, Environmental ScienceEvolutionary Biology
- 12 November 2008
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.
Evolution of the Amphibian Ear with Implications for Lissamphibian Phylogeny: Insight Gained from the Caecilian Inner Ear
Characters of the ear seemingly provide synapomorphies that unite lissamphibians with amphibamid temnospondyls, potentially improving the resolution of concepts about the affinities of frogs, salamanders, and caecilians and clarifying issues of tetrapod ear evolution.