A Marine Stem-Tetrapod from the Devonian of Western North America

@article{Swartz2012AMS,
  title={A Marine Stem-Tetrapod from the Devonian of Western North America},
  author={Brian Swartz},
  journal={PLoS ONE},
  year={2012},
  volume={7}
}
  • Brian Swartz
  • Published 2012
  • Biology, Medicine, Geography
  • PLoS ONE
The origin of terrestrial vertebrates represents one of the major evolutionary and ecological transformations in the history of life, and the established timing and environment of this transition has recently come under scrutiny. The discovery and description of a well-preserved fossil sarcopterygian (fleshy-limbed vertebrate) from the Middle Devonian of Nevada helps to refine and question aspects of the temporal and anatomical framework that underpins the tetrapod condition. This new taxon… Expand
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An early tetrapod fossil from the Upper Devonian of Pennsylvania (Catskill Formation) extends the temporal range of tetrapods in North America and suggests that they attained a virtually globalExpand
Ventastega curonica and the origin of tetrapod morphology
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The skull, exceptionally preserved braincase, shoulder girdle and partial pelvis of Ventastega curonica are presented, a transitional intermediate form between the ‘elpistostegids’ Panderichthys and Tiktaalik and the Devonian tetrapods (limbed vertebrates) Acanthostega and Ichthyostega. Expand
A Devonian tetrapod-like fish and the evolution of the tetrapod body plan
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The discovery of a well-preserved species of fossil sarcopterygian fish from the Late Devonian of Arctic Canada that represents an intermediate between fish with fins and tetrapods with limbs, and provides unique insights into how and in what order important tetrapod characters arose is reported. Expand
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The Gogo Formation of Western Australia preserves a unique Late Devonian reef fauna that has produced data on the oldest known vertebrate embryos, the anatomy of the primitive actinopterygian neurocranium, and the histology, radiation, and plasticity of dipnoan (lungfish) dental and cranial structures. Expand
The Early Evolution of the Tetrapod Humerus
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A comparative analysis of this fossil and other relevant humeri from the Devonian shows that the role of the limb in propping the body arose first in fish fins, not tetrapod limbs. Expand
An exceptional Devonian fish from Australia sheds light on tetrapod origins
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New observations from the most complete, acid-prepared Devonian tetrapodomorph fish yet discovered, Gogonasus are presented, which was previously placed just crownward of Kenichthys and rhizodontids, the most primitive taxa on the tetrapOD lineage. Expand
The emergence of early tetrapods
Abstract Study of Devonian tetrapods and their relatives spanning the so-called ‘fish–tetrapod’ transition has expanded almost exponentially in the last 15 years or so. This evolutionary event is nowExpand
EARLY TETRAPOD JAWS FROM THE LATE DEVONIAN OF PENNSYLVANIA, USA
TLDR
A new Late Devonian tetrapod, Densignathus rowei, is described, based on a well-preserved lower jaw, characterized by dramatic widening of the jaw anterior of the adductor fossa, a pronounced twist in the orientation of ventral margin of the jaws, and weakly-developed radiating ornament on the lateral surface of the infradentaries. Expand
The axial skeleton of the Devonian tetrapod Ichthyostega
TLDR
A new reconstruction of Ichthyostega is shown based on extensive re-examination of original material and augmented by recently collected specimens and reveals hitherto unrecognized regionalization in the vertebral column. Expand
Rise of the Earliest Tetrapods: An Early Devonian Origin from Marine Environment
TLDR
The results have shown that tetrapods evolved from marine environments during times of higher oxygen levels, and the change in environmental conditions played a major role in their evolution. Expand
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