Morphology of the earliest reconstructable tetrapod Parmastega aelidae

  title={Morphology of the earliest reconstructable tetrapod Parmastega aelidae},
  author={Pavel Beznosov and Jennifer Alice Clack and Ervīns Luk{\vs}evi{\vc}s and Marcello Ruta and Per Erik 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… 

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.

The Evolution of the Spiracular Region From Jawless Fishes to Tetrapods

The first confirmed example of a complete spiracular gill in any vertebrate is presented, in the galeaspid (jawless stem gnathostome) Shuyu, and comparisons with two other groups of jawless stem Gnathostomes indicate that they also probably possessed full-sized Spiracular gills and that this condition may thus be primitive for the gnathOSTome stem group.

Sustained high rates of morphological evolution during the rise of tetrapods.

It is shown that combining osteological and ichnological calibration data results in major shifts on the time of origin of all major groups of tetrapodomorphs (up to 25 million years) and that low rates of net diversification, not fossilization, explain long ghost lineages in the early tetrapdomorph fossil record.

Estuarine fish and tetrapod evolution: insights from a Late Devonian (Famennian) Gondwanan estuarine lake and a southern African Holocene equivalent

  • R. GessA. Whitfield
  • Environmental Science
    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.

Early tetrapod cranial evolution is characterized by increased complexity, constraint, and an offset from fin-limb evolution

It is found that bone loss across the origin of tetrapods is associated not only with increased complexity of bone-to-bone contacts but also with decreasing topological diversity throughout the late Paleozoic, which may be related to developmental and/or mechanical constraints.

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 in

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.

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.

The neuroecology of the water-to-land transition and the evolution of the vertebrate brain

Integration of value-weighted, memorized panoramas in basal ganglia/frontal cortex circuitry, with allocentric cognitive maps of the hippocampus and its associated cortices becomes a cognitive habit-to-plan transition as substantial as the change in ecology.

Bridging the Gap Between Mammal and Insect Ears – A Comparative and Evolutionary View of Sound-Reception

This review will start by comparing hearing between insects and mammals in an evolutionary context, then discuss current findings about sound reception, which will help to bridge the gap between both research fields.



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.

Taxonomic revision of the Late Devonian tetrapod Ichthyostega from East Greenland

  • H. Blom
  • Environmental Science, Geography
  • 2005
Abstract:  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.

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.

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.

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.

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.

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.

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.

A uniquely specialized ear in a very early tetrapod

Ichthyostega's braincase and ear region defied interpretation, such that conventional anatomical terms seemed inapplicable, and can now be seen to form part of a highly specialized ear, probably a hearing device for use in water.

Revision of the early tetrapod Obruchevichthys Vorobyeva, 1977 from the Frasnian (Upper Devonian) of the North-western East European Platform

Species composition of the genus Obruchevichthys Vorobyeva, 1977, previously based on two specimens from the Upper Frasnian (Upper Devonian) of Latvia and Leningrad Region of Russia is revised. The