The phylogeny of the ornithischian dinosaurs
Surprisingly, Heterodontosauridae is placed as the most basal group of all well‐known ornithischians, phylogenetically distant from a stem‐defined Ornithopoda, creating a topology that is more congruent with the known Ornithischian stratigraphical record.
Osteology and phylogeny of Zalmoxes (n. g.), an unusual Euornithopod dinosaur from the latest Cretaceous of Romania
A phylogenetic analysis of basal euornithopods indicates that the non‐hadrosaurid material from Hateg comprises two distinct, but congeneric, species, and indicates the recognition of a ghost lineage, extending from the most recent common ancestor of Rhabdodontidae and Iguanodontia, which extends for 73 million years.
A new hypothesis of dinosaur relationships and early dinosaur evolution
This study has found a sister-group relationship between Ornithischia and Theropoda (united in the new clade Ornithoscelida), with Sauropodomorpha and Herrerasauridae (as the redefined Saurischia) forming its monophyletic outgroup.
Telmatosaurus transsylvanicus from the late Cretaceous of Romania: the most basal hadrosaurid dinosaur
An analysis of dinosaurian biogeography: evidence for the existence of vicariance and dispersal patterns caused by geological events
- P. Upchurch, C. A. Hunn, D. Norman
- Environmental Science, GeographyProceedings of the Royal Society of London…
- 22 March 2002
The results provide the first statistically robust evidence that, from Middle Jurassic to mid‐Cretaceous times, tectonic events had a major role in determining where and when particular dinosaur groups flourished.
A primitive ornithischian dinosaur from the Late Triassic of South Africa, and the early evolution and diversification of Ornithischia
- R. Butler, Roger M. H. Smith, D. Norman
- Geography, Environmental ScienceProceedings of the Royal Society B: Biological…
- 22 August 2007
Although the group played an important role in the evolution of Late Mesozoic terrestrial ecosystems, the early evolutionary history of the ornithischian dinosaurs remains poorly understood. Here, we…
The Lower Jurassic ornithischian dinosaur Heterodontosaurus tucki Crompton & Charig, 1962: cranial anatomy, functional morphology, taxonomy, and relationships
- D. Norman, A. Crompton, R. Butler, Laura B. Porro, Laura B. Porro, A. Charig
- Environmental Science, Geography
- 1 September 2011
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.
Systematics and phylogeny of Stegosauria (Dinosauria: Ornithischia)
A cladistic analysis of Stegosauria (the first to be based upon direct observation of all relevant specimens) is presented, which indicates that Tuojiangosaurus, Loricatosaurus and Paranthodon are sister taxa to Stegosaurus.
On Asian ornithopods (Dinosauria: Ornithischia). 3. A new species of iguanodontid dinosaur
- D. Norman
- Environmental Science, Geography
The anatomy of this new ornithopod is described; it shows a number of similarities to the known species ofIguanodon, but also demonstrates features which are in some instances unique to this taxon, while others seem to be either convergent upon, or transformational with respect to, the more derived hadrosaurid Ornithopods of the Late Cretaceous.