Anatomy and Cranial Functional Morphology of the Small-Bodied Dinosaur Fruitadens haagarorum from the Upper Jurassic of the USA

@article{Butler2012AnatomyAC,
  title={Anatomy and Cranial Functional Morphology of the Small-Bodied Dinosaur Fruitadens haagarorum from the Upper Jurassic of the USA},
  author={Richard J. Butler and Laura B. Porro and Peter M. Galton and Luis Mar{\'i}a Chiappe},
  journal={PLoS ONE},
  year={2012},
  volume={7}
}
Background Heterodontosaurids are an important but enigmatic and poorly understood early radiation of ornithischian dinosaurs. The late-surviving heterodontosaurid Fruitadens haagarorum from the Late Jurassic (early Tithonian) Morrison Formation of the western USA is represented by remains of several small (<1 metre total body length, <1 kg body mass) individuals that include well-preserved but incomplete cranial and postcranial material. Fruitadens is hypothesized to represent one of the… 

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References

SHOWING 1-10 OF 195 REFERENCES

The Lower Jurassic ornithischian dinosaur Heterodontosaurus tucki Crompton & Charig, 1962: cranial anatomy, functional morphology, taxonomy, and relationships

Details of the cranial anatomy are revealed and show that the skull is unexpectedly specialized in such an early representative of the Ornithischia, including the closely packed, hypsodont crowns and ‘warping’ of the occlusal surfaces seen in the cheek dentition and jaw musculature.

A Juvenile Skull of the Primitive Ornithischian Dinosaur Heterodontosaurus Tucki from the 'Stormberg' of Southern Africa

A new partial skull of a juvenile Heterodontosaurus tucki from the 'Stormberg' of South Africa is described, providing new information on the cranial anatomy of this taxon as well as insights into cranial ontogeny, sexual dimorphism and tooth replacement in heterodontosaurids.

Lower limits of ornithischian dinosaur body size inferred from a new Upper Jurassic heterodontosaurid from North America

A new ornithischian dinosaur from the Late Jurassic of western North America that rivals the smallest theropods in size, Fruitadens haagarorum, is reported, suggesting that this taxon was an ecological generalist with an omnivorous diet within Dinosauria.

The anatomy of the basal ornithischian dinosaur Eocursor parvus from the lower Elliot Formation (Late Triassic) of South Africa

  • R. Butler
  • Environmental Science, Geography
  • 2010
Eocursor may represent the sister taxon to Genasauria, the clade that includes most of ornithischian diversity, although this phylogenetic position is partially dependent upon the uncertain phylogenetically position of the enigmatic and controversial clade Heterodontosauridae.

New heterodontosaurid specimens from the Lower Jurassic of southern Africa and the early ornithischian dinosaur radiation

ABSTRACT Heterodontosaurids are poorly understood early ornithischian dinosaurs with extensive geographic and stratigraphic ranges. The group is best known from the Lower Jurassic upper ‘Stormberg

A Middle Jurassic heterodontosaurid dinosaur from Patagonia and the evolution of heterodontosaurids

A new ornithischian dinosaur from the Middle Jurassic Cañadón Asfalto Formation in central Patagonia, Argentina is reported, and derived features of its anatomy indicate that Manidens belongs to Heterodontosauridae, as the sister taxon of HeterODontosaurus and other South African heterodontsaurids.

The postcranial osteology and phylogenetic position of the small ornithischian dinosaur Changchunsaurus parvus from the Quantou Formation (Cretaceous: Aptian–Cenomanian) of Jilin Province, north‐eastern China

A phylogenetic analysis finds relationships amongst basal ornithopods to be extremely poorly resolved, but supports a sister-group relationship between Changchunsaurus and Jeholosaurus shangyuanensis and suggests that an endemic clade of small-bodied bipedal ornithipods existed in north-east China during the Early to ‘middle’ Cretaceous.

The skull and neck of the basal theropod Herrerasaurus ischigualastensis

The skull of Herrerasaurus ischigualastensis has a rectangular profile and a transversely narrow snout and other features of the skull constitute dinosaurian synapomorphies, such as the loss of the postfrontal and small post-temporal opening.

Postcranial Anatomy of Jeholosaurus shangyuanensis (Dinosauria, Ornithischia) from the Lower Cretaceous Yixian Formation of China

A phylogenetic analysis incorporating new postcranial data confirms previous suggestions that Jeholosaurus is a basal ornithopod and that it forms a clade with Changchunsaurus and Haya; Koreanosaurus and Yueosaurus might also belong to this clade, though additional material of both will be required to test this hypothesis.

A new heterodontosaurid dinosaur (Reptilia: Ornithischia) from the Upper Triassic Red Beds of Lesotho

Dental peculiarities indicate that tooth replacement processes were suppressed in heterodontosaurids; replacement of the teeth seems to have been restricted to a brief period each year (presumably when heterodonsaurids underwent aestivation or hibernation).
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