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A basal ceratopsian with transitional features from the Late Jurassic of northwestern China
- Xing Xu, Catherine A. Forster, James M. Clark, Jinyou Mo
- Biology, GeographyProceedings of the Royal Society B: Biological…
- 7 September 2006
Character distributions along the marginocephalian lineage reveal that, compared to the bipedal Pachycephalosauria, the dominantly quadrupedal ceratopsians lost many marginocesphalian features and evolved their own characters early in their evolution.
The Earliest Pterodactyloid and the Origin of the Group
Osteology and Relationships of Byronosaurus jaffei (Theropoda: Troodontidae)
Several interesting characters of Byronosaurus jaffei have implications both for theropod relationships and for understanding patterns of variation within coelurosaurian theropods.
A nesting dinosaur
- M. Norell, James M. Clark, L. Chiappe, D. Dashzeveg
- Environmental Science, BiologyNature
- 1 December 1995
The specimen described here is the first preserved well enough to determine its precise relationship with the nest, and provides the strongest evidence yet for the presence of avian brooding behaviour in non-avian dinosaurs.
A Jurassic ceratosaur from China helps clarify avian digital homologies
A new basal Ceratosaur from the Oxfordian stage of the Jurassic period of China is reported, representing the first known Asian ceratosaur and the only known beaked, herbivorous Jurassic theropod, and possesses a strongly reduced manual digit I, documenting a complex pattern of digital reduction within the Theropoda.
A basal tyrannosauroid dinosaur from the Late Jurassic of China
The tyrannosauroid fossil record is mainly restricted to Cretaceous sediments of Laurasia, although some very fragmentary Jurassic specimens have been referred to this group. Here we report a new…
An oviraptorid skeleton from the late Cretaceous of Ukhaa Tolgod, Mongolia, preserved in an avianlike brooding position over an oviraptorid nest. American Museum novitates ; no. 3265
- James M. Clark, M. Norell, L. Chiappe, Mongolyn Shinzhlėkh Ukhaany Akademi.
- Environmental Science
The articulated postcranial skeleton of an oviraptorid dinosaur (Theropoda, Coelurosauria) from the Late Cretaceous Djadokhta Formation of Ukhaa Tolgod, Mongolia, is preserved overlying a nest. The…
A New Rhamphorhynchid Pterosaur from the Upper Jurassic of Xinjiang, China, and the Phylogenetic Relationships of Basal Pterosaurs
Sericipterus wucaiwanensis, Angustinaripterus longicephalus, Harpactognathus gentryii represent a clade of large pterosaurs that likely lived in the terrestrial settings in which they preserved and are proposed to be widespread among the non-pterodactyloids.
The skull of a relative of the stem-group bird Mononykus
The configuration of the temporal region of the skull and its articulation with the rostrum indicate the capability for prokinetic movement in which flexing occurs at the junction of the upper jaw and neurocranium, and support the idea that prokinesis preceded other types of avian intracranial kinesis.
PROBLEMS DUE TO MISSING DATA IN PHYLOGENETIC ANALYSES INCLUDING FOSSILS: A CRITICAL REVIEW
Missing data simply represent the unknown and should not be viewed as an impediment to considering all available evidence in phylogenetic analyses, nor used as justification for excluding specific taxa or characters.