Mandibles of rhizodontids: anatomy, function and evolution within the tetrapod stem-group

@article{Jeffery2002MandiblesOR,
  title={Mandibles of rhizodontids: anatomy, function and evolution within the tetrapod stem-group},
  author={Jonathan E. Jeffery},
  journal={Transactions of the Royal Society of Edinburgh: Earth Sciences},
  year={2002},
  volume={93},
  pages={255 - 276}
}
  • J. Jeffery
  • Published 1 September 2002
  • Geography
  • Transactions of the Royal Society of Edinburgh: Earth Sciences
ABSTRACT The Rhizodontida (Pisces: Sarcopterygii) is a clade of predatory fishes from the Upper Devonian (Aztecia; ?Givetian of Antarctica) through to the Upper Carboniferous (Strepsodus; Moscovian of northern Europe and North America). They form the most basal plesion within the tetrapod stem-lineage. The mandibles were dominated by large symphysial tusks on the dentary. Not much else is known of the mandibles in primitive rhizodontids. However, later forms show several derived characters: the… 

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References

SHOWING 1-10 OF 106 REFERENCES

A new rhizodontiform fish from the Early Carboniferous of Victoria, Australia, with remarks on the phylogenetic position of the group

TLDR
The skull roof of Barameda, gen. nov., differs from that of Osteolepiformes in having a larger extratemporal bone that contacts the intertemporal, by the overlap areas on the interTemporal, and in having fewer snout bones.

Pectoral fins of rhizodontids and the evolution of pectoral appendages in the tetrapod stem-group

TLDR
The pectoral fin skeleton of Rhizodus hibberti, a derived member of the Rhizodontida, is described in detail for the first time, showing that muscular processes of the humerus may have appeared later in tetrapod evolution than previously thought.

A complete primitive rhizodont from Australia

TLDR
The new evidence shows that rhizodonts are more remote from tetrapods than are osteolepiform and elpistostegid lobe-fin fishes and the pectoral fin of Sauripteris should not be used as a model limb precursor.

Second tristichopterid (Sarcopterygii, Osteolepiformes) from the Upper Devonian of Canowindra, New South Wales, Australia, and phylogeny of the Tristichopteridae

ABSTRACT A new tristichopterid, Cabonnichthys burnsi gen. et sp. nov. from the Upper Devonian Mandagery Sandstone near Canowindra, New South Wales, Australia, is the second tristichopterid to be

Lower jaws, lower tetrapods–a review based on the Devonian genus Acanthostega

Abstract The lower jaw of the Devonian tetrapod Acanthostega is described for the first time. Redescriptions are provided for the lower jaws of the elpistostegid Panderichthys, the Devonian tetrapods

A near‐tetrapod from the Baltic Middle Devonian

TLDR
Livoniana has a strikingly autapomorphic dentary dentition comprising multiple tooth rows, providing evidence both for the unexpectedly early evolution of tetrapod characteristics and for morphological radiation around the fish‐tetrapod transition.

On the Amphibian Crassigyrinus scoticus Watson from the Carboniferous of Scotland

TLDR
A case is made for the 'sister-group' relation of Crassigyrinus to the anthracosauroids and a cladogram presented of the subgroups involved; it is, however, difficult to make a case for the close relationship of CrASSIGyrinus and the Seymouriamorpha and the closeness of relationship of the latter to anthracosaurs is questioned.

A new tristichopterid (Osteolepiformes: Sarcopterygii) from the Mandagery Sandstone (Late Devonian, Famennian) near Canowindra, NSW, Australia

  • Z. JohansonP. Ahlberg
  • Environmental Science
    Transactions of the Royal Society of Edinburgh: Earth Sciences
  • 1997
Abstract A new member of the Tristichopteridae (=Eusthenopteridae), Mandageria fairfaxi gen. et sp. nov., is described from the Late Devonian (Famennian) Mandagery Sandstone outcropping near

Devonian Vertebrates From Colombia

Vertebrate remains are reported from the Emsian–Eifelian Floresta Formation and the Late Devonian (?Frasnian) Cuche Formation of north‐eastern Colombia. The material from the Floresta Formation is

A new porolepiform-like fish, Psarolepis romeri, gen. et sp. nov. (Sarcopterygii, Osteichthyes) from the Lower Devonian of Yunnan, China

TLDR
A new sarcopterygian fish, Psarolepis, gen. nov. (Sarcopterygii, Osteichthyes) is described from the Lower Devonian of Eastern Yunnan, China, which manifests many porolepiform-like features.
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