A Phylogenetic Perspective on Locomotory Strategies in Early Amniotes
This work investigates the major locomotory strategies that have been posited for Paleozoic amniotes by optimizing the major Locomotory styles identified for these taxa onto the consensus tree, in order to present an overview of the pattern of evolution of locomOTory strategies inherited and adopted by various amniote lineages.
A Phylogenetic Perspective on Locomotory Strategies in Early Amniotes1
Using a phylogeny representing the current consensus in the literature, the major locomotory strategies that have been posited for Paleozoic amniotes are investigated by optimizing the major Locomotory styles identified for these taxa onto the consensus tree in order to present an overview of the pattern of evolution of locomOTory strategies inherited and adopted by various amniote lineages.
Toward the Origin of Amniotes: Diadectomorph and Synapsid Footprints from the Early Late Carboniferous of Germany
- Geography, Environmental Science
Trackway parameters and imprint morphology strongly support basal diadectomorphs and “pelycosaurian” -grade synapsid reptiles, respectively, as the most likely trackmakers of large tetrapod footprints from western Germany.
Assembling the history of the Parareptilia: phylogeny, diversification, and a new definition of the clade
The results show that a significant increase in diversification rate could be recorded only among Triassic procolophonoids, making it difficult to interpret evolutionary novelties such as herbivory or impedance-matching hearing as being key innovations that might have driven diversification.
AN EARLY CAPTORHINID REPTILE (AMNIOTA, EUREPTILIA) FROM THE UPPER CARBONIFEROUS OF HAMILTON, KANSAS
- Environmental Science, Geography
Abstract A new eureptile, Concordia cunninghami, gen. et sp. nov., is described from the Upper Pennsylvanian Hamilton-Fossillagerstätte, Kansas, U.S.A. The new taxon is currently known on the basis…
Paleogenomic data suggest mammal‐like genome size in the ancestral amniote and derived large genome size in amphibians
- BiologyJournal of evolutionary biology
The polarity of amniote genome size evolution is reported on using genome size estimates for 14 extinct tetrapod genera from the Paleozoic and early Mesozoic Eras using osteocyte lacunae size as a correlate to find substantial support for a phylogenetically controlled regression model relating genome size to osteocytes size.
The evolutionary position of turtles revised
- Biology, Environmental ScienceNaturwissenschaften
Abstract. Consensus on the evolutionary position of turtles within the amniote phylogeny has eluded evolutionary biologists for more than a century. This phylogenetic problem has remained unsolved…
The Oldest Caseid Synapsid from the Late Pennsylvanian of Kansas, and the Evolution of Herbivory in Terrestrial Vertebrates
- Environmental Science, GeographyPloS one
These results demonstrate for the first time that large caseid herbivores evolved from small, non-herbivorous caseids, and are mirrored by three other clades, documenting multiple, independent, but temporally staggered origins of herbivory and increase in body size among early terrestrial tetrapods, leading to patterns consistent with modern terrestrial ecosystem.
Recent Advances in the (Molecular) Phylogeny of Vertebrates
A discussion of limitations of currently used molecular markers and phylogenetic methods as well as the contribution of molecular phylogenetic data to their resolution are presented.
Evolutionary patterns in early tetrapods. II. Differing constraints on available character space among clades
- BiologyProceedings of the Royal Society B: Biological Sciences
This work modify techniques similar to those used by ecologists to infer species richnesses to estimate the number of potentially varying characters given the distributions of changes implied by a model phylogeny, and shows that stem lissamphibians and stem amniotes both had restrictions on some parts of character space but also invaded new character space that had been unavailable to stem tetrapods.
SHOWING 1-10 OF 21 REFERENCES
PROBLEMS OF THE ORIGIN OF REPTILES
- Environmental Science, Geography
The earliest captorhino‐morphs, from the Lower Pennsylvanian, are already fully developed reptiles, and the limnoscelids and solenodonsaurids are more primitive forms, retaining features typical of anthracosaurian amphibians.
The Early Permian reptile Acleistorhinus pteroticus and its phylogenetic position
It is indicated that this Early Permian amniote from North America is the oldest known member of Parareptilia, and a phylogenetic analysis of parareptile interrelationships demonstrates that Acleistorhinus is a sister taxon to the Russian clade Lanthanosuchidae.
A reevaluation of early amniote phylogeny
- Biology, Geography
It is indicated that three major clades of amniotes extend from the present to the Palaeozoic, and these three clades are the Synapsida (including Mammalia), Parareptilia (including Testudines), and Eureptili (including Sauria).
Developmental aspects of lepospondyl vertebrae in Paleozoic tetrapods
- Environmental Science
The transition between the two major patterns of vertebral structure among Paleozoic tetrapods may be attributed to selection for more rapid ossification and retention of a minimally restricted notochord during development, as well as the advantages of a solid, spoolshaped structure in the adult.
The earliest known reptile
- Environmental Science, GeographyNature
The discovery of a much earlier amniote skeleton from the Brigantian (Lower Carboniferous) of Scotland, which thus represents the earliest occurrence of amniotes in the fossil record.
The Ancestry of Reptiles
The ancestry of captorhinomorph reptiles from the gephyrostegid anthracosaurs can be firmly established and the nature of the amphibian-reptilian transition must be studied on the basis of relicts of earlier groups which are contemporary with true reptiles.
Phylogenetic relationships of captorhinomorph reptiles
Shared derived character states indicate that captorhinomorphs are not the sister taxon of all other reptiles but are advanced relative to pelycosaurs, pareiasaur, and procolophonids.
Correlated progression and the origin of turtles
It is shown that certain pareiasaurs—dwarf, heavily armoured forms such a Nanoparia—approach the chelonian morphology even more closely than previously thought, suggesting that the rigid armoured body of turtles evolved gradually, through 'correlated progression'.
Historical Burden In Systematics And The Interrelationships Of ‘Parareptiles’
Turtles are the highly modified survivors of a radiation of poorly‐known reptiles commonly called ‘parareptiles’, and the procolophonoid hypotheses is supported by only one synapomorphy (the slender stapes).