Morphology of the earliest reconstructable tetrapod Parmastega aelidae

  title={Morphology of the earliest reconstructable tetrapod Parmastega aelidae},
  author={P. Beznosov and J. Clack and E. Luk{\vs}evi{\vc}s and M. Ruta and P. Ahlberg},
The known diversity of tetrapods of the Devonian period has increased markedly in recent decades, but their fossil record consists mostly of tantalizing fragments1–15. The framework for interpreting the morphology and palaeobiology of Devonian tetrapods is dominated by the near complete fossils of Ichthyostega and Acanthostega; the less complete, but partly reconstructable, Ventastega and Tulerpeton have supporting roles2,4,16–34. All four of these genera date to the late Famennian age (about… Expand
8 Citations
The smallest known Devonian tetrapod shows unexpectedly derived features
Brittagnathus is described from a single complete right lower jaw ramus recovered from the Acanthostega mass-death deposit in the upper part of the Britta Dal Formation of Stensiö Bjerg, Gauss Peninsula, East Greenland and suggests that diversification of ‘Carboniferous-grade’ tetrapods had already begun before the end of the Devonian and that the group was not greatly affected by the end-Devonian mass extinction. Expand
Estuarine fish and tetrapod evolution: insights from a Late Devonian (Famennian) Gondwanan estuarine lake and a southern African Holocene equivalent
  • R. Gess, A. Whitfield
  • Medicine, Geography
  • Biological reviews of the Cambridge Philosophical Society
  • 2020
Correlation of tetrapods (and elpistostegids) with fish nursery areas in the Late Devonian lends strong support to this hypothesis, suggesting that adaptations permitting improved access to the abundant juvenile fish within the littoral zone of estuarine lakes and continental water bodies may have been pivotal in the evolution of Tetrapods. Expand
The feeding system of Tiktaalik roseae: an intermediate between suction feeding and biting
It is shown that a key intermediate, Tiktaalik roseae, was capable of cranial kinesis despite significant restructuring of the skull to facilitate biting and snapping, and might have been an important intermediate step in the evolution of terrestrial feeding systems by maintaining suction-generation capabilities while simultaneously elaborating a mechanism for biting-based prey capture. Expand
Early tetrapods had an eye on the land
The ancient bones of a newly discovered species of tetrapod provide crucial missing evidence on how aquatic vertebrates evolved into land dwellers. Expand
Bridging the Gap Between Mammal and Insect Ears – A Comparative and Evolutionary View of Sound-Reception
Insects must wonder why mammals have ears only in their head and why they evolved only one common principle of ear design—the cochlea. Ears independently evolved at least 19 times in different insectExpand
Ferritins in Chordata: Potential evolutionary trajectory marked by discrete selective pressures
It is hypothesized that two significant factors have been involved in the evolution of ferritin proteins: fluctuations of atmospheric oxygen concentrations, altering redox potential, and changing availability of water rich in bioavailable ferric ions. Expand
Osteology and digital reconstruction of the skull of the early tetrapod Whatcheeria deltae
ABSTRACT The Early Carboniferous stem tetrapod Whatcheeria deltae is among the earliest-branching limbed tetrapods represented by multiple near-complete specimens, making it an important taxon inExpand
Ferritins in Chordata: Potential evolutionary trajectorymarked by discrete selective pressures History and reclassification of ferritins in chordates and geological events’ influence on their evolution and radiation
  • 2020


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
Life history of the stem tetrapod Acanthostega revealed by synchrotron microtomography
The first, to the authors' knowledge, life history data for a Devonian tetrapod, from the Acanthostega mass-death deposit of Stensiö Bjerg, East Greenland is presented, showing that even the largest individuals from this deposit are juveniles. Expand
The postcranial skeleton of the Devonian tetrapod Tulerpeton curtum Lebedev
A cladistic analysis indicates that Tulerpeton is a reptiliomorph stem-group amniote and the earliest known crown-group tetrapod: Acanthostega and Ichthyostega are successively more derived plesion stem- group tetrapods and do not consititute a monophyletic ichthyostegalian radiation. Expand
Elginerpeton pancheni and the earliest tetrapod clade
Elginerpeton, described here on the basis of cranial remains from Scat Craig, is, together with the fragmentary genus Obruchevichthys from the Upper Frasnian of Latvia and Russia, the oldest known stem tetrapod. Expand
Taxonomic revision of the Late Devonian tetrapod Ichthyostega from East Greenland
:  Two morphologically distinct assemblages of the Late Devonian tetrapod Ichthyostega from East Greenland are described on the basis of a large collection of skulls and postcranial elements. SkullExpand
The First Tetrapod Finds from the Devonian (Upper Famennian) of Latvia
The lower jaw of Ventastega is strikingly primitive in retaining fangs on the coronoid series, but shares many characters with those of other known Devonian tetrapods, and some of these features are interpreted as basal tetrapod synapomorphies. Expand
A tetrapod fauna from within the Devonian Antarctic Circle
Two previously unknown tetrapod from the Late Devonian (late Famennian) Gondwana locality of Waterloo Farm in South Africa are described, which demonstrate that Devonian tetrapods were not restricted to warm environments and suggest that they may have been global in distribution. Expand
Late Devonian tetrapod remains from Red Hill, Pennsylvania, USA: how much diversity?
The difficulty in making taxonomic associations with isolated remains, even when found in close proximity to one another is demonstrated, and exploration of the characteristics of each element demonstrates the presence of at least three early tetrapod taxa at the Red Hill site. Expand
New discoveries of tetrapods (ichthyostegid-like and whatcheeriid-like) in the Famennian (Late Devonian) localities of Strud and Becco (Belgium)
Tetrapod remains from two Famennian localities from Belgium are described, confirming that environments favourable to early tetrapod life were often colonized by several tetrapOD taxa and several derived anatomical characters allowing their tentative assignment to a whatcheeriid-grade group. Expand
Tetrapod trackways from the early Middle Devonian period of Poland
Well-preserved and securely dated tetrapod tracks from Polish marine tidal flat sediments of early Middle Devonian (Eifelian stage) age are presented, forcing a radical reassessment of the timing, ecology and environmental setting of the fish–tetrapod transition, as well as the completeness of the body fossil record. Expand