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Feathered Non-Avian Dinosaurs from North America Provide Insight into Wing Origins
- Darla K. Zelenitsky, François Therrien, F. Hadfield
- Environmental Science, BiologyScience
- 26 October 2012
The Ornithomimus specimens, recovered from Upper Cretaceous deposits of Alberta, Canada, provide new insights into dinosaur plumage and the origin of the avian wing, and show that primordial wings originated earlier than previously thought, among non-maniraptoran theropods.
Evolution of olfaction in non-avian theropod dinosaurs and birds
- Darla K. Zelenitsky, François Therrien, R. Ridgely, Amanda R. McGee, L. Witmer
- Biology, Environmental ScienceProceedings of the Royal Society B: Biological…
- 22 December 2011
The results show that, rather than decreasing, the importance of olfaction actually increased during early bird evolution, representing a previously unrecognized sensory enhancement.
A Pair of Shelled Eggs Inside A Female Dinosaur
- Tamaki Sato, Yen-nien Cheng, Xiaocong Wu, Darla K. Zelenitsky, Y. Hsiao
- Environmental Science, GeographyScience
- 15 April 2005
The orientations of the eggs inside the skeleton and in clutches indicate that the mother came to the center of the nest to lay eggs, suggesting that an entire egg clutch was laid through multiple ovipositions.
Olfactory acuity in theropods: palaeobiological and evolutionary implications
- Darla K. Zelenitsky, François Therrien, Yoshitsugu Kobayashi
- Environmental Science, BiologyProceedings of the Royal Society B: Biological…
- 22 February 2009
Olfactory acuity was the lowest in ornithomimosaurs and oviraptorids, suggesting a reduced reliance on olfaction and perhaps an omnivorous diet in these theropods.
Parataxonomic classification of ornithoid eggshell fragments from the Oldman Formation (Judith River Group; Upper Cretaceous), southern Alberta
The ootaxa described indicate a diversity of both avian and theropod dinosaur egg layers within Devil9s Coulee and Knight9s Ranch, southern Alberta, during the Late Cretaceous.
Eggshell Taphonomy at Modern Gull Colonies and a Dinosaur Clutch Site
- J. L. Hayward, Darla K. Zelenitsky, Denise L. Smith, Darlene M. Zaft, Jere K. Clayburn
- Environmental Science, Geography
- 1 August 2000
Eggshell weathering, fragmentation, dispersal, orientation, and dispersion patterns should be characterized during the excavation of fossilized eggs and nest sites were characterized in field and laboratory studies.
Bird-like characteristics of troodontid theropod eggshell
The identification of squamatic ultrastructure in troodontid eggshell, which was previously thought to lack this structure, reveals problems with the previous assignment of this eggshell to the dinosauroid-prismatic morphotype and with the concept of eggshell morphotype in the current eggshell parataxonomy.
PHYLOGENETIC ANALYSIS OF REPRODUCTIVE TRAITS OF MANIRAPTORAN THEROPODS AND ITS IMPLICATIONS FOR EGG PARATAXONOMY
The results indicate that several avian reproductive traits, such as adults sitting on eggs, asymmetrical eggs, unornamented eggshell surface, and complex eggshell ultrastructure, were already present in non‐avian maniraptorans, and could have evolved in more basal theropods.
FIRST RECORD OF ELONGATOOLITHID THEROPOD EGGSHELL FROM NORTH AMERICA: THE ASIAN OOGENUS MACROELONGATOOLITHUS FROM THE LOWER CRETACEOUS OF UTAH
The thickness, ornamentation, and elongatoolithid microstructure indicate that the holotype and referred materials assigned to Boletuoolithus carlylensis are indistinguishable from the Asian elongatoolsithid Macroelongatoolithsus xixiaensis.
Normal and pathological eggshells of Spheroolithus albertensis, oosp. nov., from the Oldman Formation (Judith River Group, late Campanian), southern Alberta
ABSTRACT Eggshell fragments collected from the Oldman Formation, southern Alberta, are described as Spheroolithus albertensis, oosp. nov. This oospecies exhibits a spheroolithid microstructure,…