Taxonomy, morphology, masticatory function and phylogeny of heterodontosaurid dinosaurs

  title={Taxonomy, morphology, masticatory function and phylogeny of heterodontosaurid dinosaurs},
  author={Paul C. Sereno},
  pages={1 - 225}
  • P. Sereno
  • Published 10 March 2012
  • Environmental Science, Geography
  • ZooKeys
Abstract Heterodontosaurids comprise an important early radiation of small-bodied herbivores that persisted for approximately 100 My from Late Triassic to Early Cretaceous time. Review of available fossils unequivocally establishes Echinodon as a very small-bodied, late-surviving northern heterodontosaurid similar to the other northern genera Fruitadens and Tianyulong. Tianyulong from northern China has unusual skeletal proportions, including a relatively large skull, short forelimb, and long… 

The cranial anatomy of the neornithischian dinosaur Thescelosaurus neglectus

The new morphological observations presented herein, combined with re-examination of the holotype of Parksosaurus, suggest that Parksosaurus shares a closer relationship with Thescelosaurus than with Gasparinisaura, and that many of the features previously cited to support a relationship with the latter taxon are either also present in Thes Celosaurus, are artifacts of preservation, or are the result of incomplete preparation and inaccurate interpretation of specimens.

New heterodontosaurid remains from the Cañadón Asfalto Formation: cursoriality and the functional importance of the pes in small heterodontosaurids

It is concluded that these fossil remains represent a bipedal heterodontosaurid but lack diagnostic characters to identify them at the species level, although they probably represent remains of Manidens condorensis, known from the same locality.

Morphological Diversity and Evolution of the Jugal in Dinosaurs

The conspicuous jugal ornaments seen in many ornithischian dinosaurs, like the less striking ones documented in some saurischians, may have played an important role in the social behavior of the species that possessed them, adding to the evidence that agonistic behavior was likely widespread among Ornithischians in particular.

Osteology of Eoraptor lunensis (Dinosauria, Sauropodomorpha)

ABSTRACT We describe the basal sauropodomorph Eoraptor lunensis, based on the nearly complete holotypic skeleton and referred specimens, all of which were discovered in the Cancha de Bochas Member

Craniomandibular osteology of Macrocollum itaquii (Dinosauria: Sauropodomorpha) from the Late Triassic of southern Brazil

  • R. Müller
  • Biology, Environmental Science
    Journal of Systematic Palaeontology
  • 2019
A detailed description of the craniomandibular anatomy of M. itaquii is presented, based on the holotype, a paratype and a newly referred specimen, to elucidate the transition from slender basal sauropodomorphs to more robust derived members within this group.

The dentition of Manidens condorensis (Ornithischia; Heterodontosauridae) from the Jurassic Cañadón Asfalto Formation of Patagonia: morphology, heterodonty and the use of statistical methods for identifying isolated teeth

New isolated teeth found in the Cañadón Asfalto Formation are reported, revealing the presence of undescribed and new autapomorphical features, including apical and basal wear facets on the occlusal surface of isolated crowns and a wear surface also in the caniniform tooth.

A comprehensive anatomical and phylogenetic evaluation of Dilophosaurus wetherilli (Dinosauria, Theropoda) with descriptions of new specimens from the Kayenta Formation of northern Arizona

Many characters of the axial skeleton of Dilophosaurus wetherilli are derived compared to Late Triassic theropods and may be associated with macropredation and an increase in body size in Theropoda across the Triassic-Jurassic boundary.

New dinosaur (Theropoda, stem-Averostra) from the earliest Jurassic of the La Quinta formation, Venezuelan Andes

Data show that the sampled summer-wet equatorial belt, which yielded the new taxon, played a pivotal role in theropod evolution across the Triassic–Jurassic boundary, as well as suggesting an earliest Jurassic maximum age for the La Quinta Formation.

A new Heterodontosaurus specimen elucidates the unique ventilatory macroevolution of ornithischian dinosaurs

A new, fully articulated skeleton of the early branching ornithischian Heterodontosaurus tucki is presented, revealing a suite of novel postcranial features unknown in any other ornithischerian, with implications for the early evolution of the group.

Tooth development, histology, and enamel microstructure in Changchunsaurus parvus: Implications for dental evolution in ornithopod dinosaurs

Tooth histology and development in the "middle" Cretaceous ornithischian dinosaur Changchunsaurus parvus is described, and wavy enamel is suggested to have evolved in association with a shearing-type dentition in a roughly symmetrically-enameled crown.



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The lack of wear facets and plesiomorphic dentition suggest that Fruitadens used orthal jaw movements and employed simple puncture-crushing to process food, suggesting that fruitadens was an ecological generalist, consuming select plant material and possibly insects or other invertebrates.

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.

A heterodontosaurid ornithischian dinosaur from the Upper Triassic of Patagonia

Fragmentary remains of a new heterodontosaurid species, comparable to Heterodontosaurus Crompton and Charig, were discovered in concretions in the Laguna Colorada Forrnation, a Late Triassic

Tooth function and replacement in early Mesozoic ornithischian dinosaurs: implications for aestivation

Thulborn (1978, Leihaia II) suggests that ornithischian dinosaurs of the upper Stormberg Series (Late Triassic-Early Jurassic) of southern Africa underwent aestivation during an annual dry season.

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 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 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).

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.

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

The origin and early evolution of dinosaurs

The oldest unequivocal records of Dinosauria were unearthed from Late Triassic rocks accumulated over extensional rift basins in southwestern Pangea, and the group achieved a nearly global distribution by the latest Triassic, especially with the radiation of saurischian groups such as “prosauropods” and coelophysoids.