Cranial anatomy of the Late Triassic phytosaur Machaeroprosopus, with the description of a new species from West Texas

@article{Hungerbhler2012CranialAO,
  title={Cranial anatomy of the Late Triassic phytosaur Machaeroprosopus, with the description of a new species from West Texas},
  author={Axel Hungerb{\"u}hler and Bill D. Mueller and Sankar Chatterjee and Doug Cunningham},
  journal={Earth and Environmental Science Transactions of the Royal Society of Edinburgh},
  year={2012},
  volume={103},
  pages={269 - 312}
}
ABSTRACT The skull anatomy of a new species of the phytosaur Machaeroprosopus is described for the first time on the basis of two specimens from the Upper Triassic Cooper Canyon Formation of Texas. Additional information is provided by a third specimen referred to Machaeroprosopus sp. A paranasal bone, an additional paired element of the narial region, is identified. Important new data are presented for the braincase, including the morphology of the epipterygoid and presphenoid, an anterior… 
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References

SHOWING 1-10 OF 166 REFERENCES
Cranial osteology of Longosuchus meadei and the phylogeny and distribution of the Aetosauria
TLDR
The structure of the single well preserved skull was restudied in light of the appearance of new material of other archosaurs subsequent to Sawin's original description, and an ossified orbitosphenoid and several structures associated with the nasolacrimal duct system are described and discussed for the first time.
The Late Triassic Phytosaur Mystriosuchus Westphali, With A Revision of the Genus
TLDR
This study demonstrates that a detailed analysis of the cranial anatomy and the rigorous application of cladistic principles to identified character states help to clarify current inconsistencies in the taxonomy and nomenclature of phytosaurs.
A Revision of Sphenosuchus acutus Haughton, a Crocodylomorph Reptile from the Elliot Formation (Late Triassic or Early Jurassic) of South Africa
TLDR
It is concluded that the most important steps in crocodylomorph evolution, particularly in the skull, had taken place in sphenosuchians, hence they should be included in the same taxon as protosuchian and more advanced crocodilians, rather than with thecodontians.
The skull of Postosuchus kirkpatricki (Archosauria: Paracrocodyliformes) from the Upper Triassic of the United States
TLDR
This description indicates that Postosuchus shares several previously unrecognized synapomorphies with crocodylomorphs, including fossae and foramina in the dermatocranium that are not present in other basal pseudosuchians.
Phytosaurs (Reptilia: Archosauria) from the Upper Triassic New Oxford Formation of York County, Pennsylvania
ABSTRACT An incomplete well-preserved skull of a small phytosaur from the Upper Triassic New Oxford Formation of York County, Pennsylvania, resembles skulls previously referred to Rutiodon
Cranial anatomy of Stenonychosaurus inequalis (Saurischia, Theropoda) and its bearing on the origin of birds
TLDR
The middle ear cavity is well defined and is connected to at least two systems of sinuses in the skull bones, which strengthen the claim that small carnivorous dinosaurs are more plausible bird ancestors than either pseudosuchians or crocodiles.
A new taxon of phytosaur (Archosauria: Pseudosuchia) from the Late Triassic (Norian) Sonsela Member (Chinle Formation) in Arizona, and a critical reevaluation of Leptosuchus Case, 1922
TLDR
Support for the previously proposed, but undemonstrated, sister taxon relationship between Angistorhinus and Rutiodon is not supported, Paleorhinus is recovered as paraphyletic, and a subset of taxa traditionally included within Leptosuchus are found to be more closely related to Pseudopalatinae, rendering LeptOSuchus paraphYletic.
REDESCRIPTION OF THE SKULL OF SAUROSUCHUS GALILEI (ARCHOSAURIA: RAUISUCHIDAE)
TLDR
The poor ossification of the articular end of the quadrate, disarticulation of the braincase from the dermatocranium, and poor development of the suture between exoccipitals and basioccipital in the skull of Saurosuchus indicate that the specimen was a juvenile.
THE LATE TRIASSIC CANJILON QUARRY (UPPER CHINLE GROUp, NEW MEXICO) PHYTOSAUR SKULLS: EVIDENCE OF SEXUAL DIMORPHISM IN PHYTOSAURS
TLDR
The most parsimonious explanation of these two variants in rostral crest morphology in a single death assemblage is that Pseudopalatus-grade phytosaurs were sexually dimorphic.
Variation in the Late Triassic Canjilon quarry (Upper Chinle Group, New Mexico) phytosaur skulls: a case for sexual dimorphism
TLDR
This work has found the first clear evidence of sexual dimorphism in phytosaurs, and has important implications for phytosaur species-level taxonomy, as well as for understanding aspects of their paleobiology (e.g., population dynamics).
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