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Reassessment of the Morphology and Paleobiology of the Therocephalian Tetracynodon Darti (Therapsida), And The Phylogenetic Relationships of Baurioidea
The brain is strikingly plesiomorphic in many features, but generally shows features that are intermediate between gorgonopsians and cynodonts, thus clarifying this stage of the evolution of the synapsid brain.
Vertebrate Paleontology of Nooitgedacht 68: A Lystrosaurus maccaigi-Rich Permo-Triassic Boundary Locality in South Africa
The farm Nooitgedacht 68 in the Bethulie District of the South African Karoo Basin contains strata that record a complete Permo-Triassic boundary sequence providing important new data regarding the…
Cranial Morphology of Recumbirostrans (Lepospondyli) from the Permian of Kansas and Nebraska, and Early Morphological Evolution Inferred by Micro-Computed Tomography
ABSTRACT ‘Microsaurs’ (Lepospondyli) were a group of tetrapods whose fossil record spanned the Mississippian—Early Permian, and have sometimes been implicated in the origins of lissamphibians…
Bone Microvasculature Tracks Red Blood Cell Size Diminution in Triassic Mammal and Dinosaur Forerunners
PLEMMYRADYTES SHINTONI, GEN. ET SP. NOV., AN EARLY PERMIAN AMPHIBAMID (TEMNOSPONDYLI: DISSOROPHOIDEA) FROM THE ESKRIDGE FORMATION, NEBRASKA
A new genus and species of amphibamid dissorophoid, Plemmyradytes shintoni, is described from the lower half of the Permian-aged Eskridge Formation near Humboldt, Nebraska, and the demonstration of evolutionary trends within the family based on the new data allows a comparison of competing phylogenetic hypotheses.
An investigation into the cladistic relationships and monophyly of therocephalian therapsids (Amniota: Synapsida)
- A. Huttenlocker
- 1 December 2009
The analysis supports the hypothesis that Therocephalia represents the monophyletic sister taxon to Cynodontia, with as many as 15 morphological synapomorphies, in contrast with other recent analyses of lesser taxon sampling.
The Cranial Morphology of a New Genus of Lungfish (Osteichthyes: Dipnoi) from the Upper Jurassic Morrison Formation of North America
The North American Ceratodus record is reexamined in light of more complete material from the Temple Canyon localities of the Morrison Formation of Colorado, USA and is found to be an assemblage of forms with disparate cranial morphology.
Provincialization of terrestrial faunas following the end-Permian mass extinction
- C. Sidor, Daril A. Vilhena, Linda A. Tsuji
- Environmental Science, GeographyProceedings of the National Academy of Sciences
- 29 April 2013
The recognition of heterogeneous tetrapod communities in the Triassic implies that the end-Permian mass extinction afforded ecologically marginalized lineages the ecospace to diversify, and that biotic controls were fundamentally reset.
Body Size Reductions in Nonmammalian Eutheriodont Therapsids (Synapsida) during the End-Permian Mass Extinction
- A. Huttenlocker
- Environmental Science, GeographyPloS one
- 3 February 2014
Evaluating temporal and phylogenetic distributions of body size in Permo-Triassic therocephalian and cynodont therapsids using a museum collections-based approach and time series model fitting on a regional stratigraphic sequence from the Karoo Basin, South Africa supports significant size reductions in the immediate aftermath of the end-Permian mass extinction.