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A new North American therizinosaurid and the role of herbivory in ‘predatory’ dinosaur evolution
- Lindsay E. Zanno, D. Gillette, L. Albright, A. Titus
- Biology, MedicineProceedings of the Royal Society B: Biological…
- 7 October 2009
It is suggested that hypercarnivory in paravian dinosaurs is a secondarily derived dietary specialization and provide a potential mechanism for the invasion of novel morpho- and ecospace early in coelurosaurian evolution—the loss of obligate carnivory and origin of dietary opportunism.
A New Troodontid Theropod, Talos sampsoni gen. et sp. nov., from the Upper Cretaceous Western Interior Basin of North America
- Lindsay E. Zanno, D. Varricchio, P. O’Connor, A. Titus, Michael J. Knell
- Biology, MedicinePloS one
- 19 September 2011
The presence of a distinct troodontid taxon in the Kaiparowits Formation supports the hypothesis that late Campanian dinosaurs of the Western Interior Basin exhibited restricted geographic ranges and suggests that the taxonomic diversity of Late Cretaceous troodonids from North America is currently underestimated.
Osteology of Falcarius utahensis (Dinosauria: Theropoda): characterizing the anatomy of basal therizinosaurs
- Lindsay E. Zanno
Results of this study reveal a significant degree of morphological disparity between Falcarius utahensis and the evidently coeval primitive theriz Dinosaur Beipiaosaurus inexpectus and help characterize morphological transformations occurring in the therizinosaur lineage that are of phylogenetic significance, particularly with regard to the highly derived presacral axial column.
Herbivorous ecomorphology and specialization patterns in theropod dinosaur evolution
- Lindsay E. Zanno, P. Makovicky
- Biology, MedicineProceedings of the National Academy of Sciences
- 20 December 2010
A refined approach for assessing trophic habits in fossil taxa is presented and evidence indicating that the early evolution of a beak in coelurosaurians correlates with an herbivorous diet is found, as well as evidence for a common succession of increasing specialization to herbivory in the subclades Ornithomimosauria and Oviraptorosauria.
VELAFRONS COAHUILENSIS, A NEW LAMBEOSAURINE HADROSAURID (DINOSAURIA: ORNITHOPODA) FROM THE LATE CAMPANIAN CERRO DEL PUEBLO FORMATION, COAHUILA, MEXICO
The crest structure of Velafrons more closely resembles that of Corythosaurus and Hypacrosaurus because it possesses an anteriorly projecting nasal process over the dorsal premaxilla process.
A taxonomic and phylogenetic re-evaluation of Therizinosauria (Dinosauria: Maniraptora)
- Lindsay E. Zanno
- 3 November 2010
Time calibration of ingroup relationships indicates a pre-Turonian dispersal event is needed to account for the presence of therizinosaurids in the Late Cretaceous of North America and Asia; this conclusion supports previous hypotheses of a Laurasian faunal interchange event during the Albian.
Biogeography of terrestrial and freshwater vertebrates from the late Cretaceous (Campanian) Western Interior of North America
Abstract Previous biogeographic studies of late Cretaceous (late Campanian) vertebrate faunas in the Western Interior Basin (WIB) of North America have suggested the presence of faunal and floral…
A primitive therizinosauroid dinosaur from the Early Cretaceous of Utah
- J. Kirkland, Lindsay E. Zanno, Scott D. Sampson, James M. Clark, D. Deblieux
- Biology, MedicineNature
- 5 May 2005
A new, primitive therizinosauroid is described from an extensive paucispecific bonebed at the base of the Cedar Mountain Formation of east-central Utah, indicating that this species documents the earliest known stage in the poorly understood transition from carnivory to herbivory within Therizinosauroidea.
Neovenatorid theropods are apex predators in the Late Cretaceous of North America.
A giant new species of allosauroid--Siats meekerorum gen. et sp. nov.--is described, providing the first evidence for the cosmopolitan clade Neovenatoridae in North America and demonstrating that the clade endured there into the Late Cretaceous.
THE PECTORAL GIRDLE AND FORELIMB OF THE PRIMITIVE THERIZINOSAUROID FALCARIUS UTAHENSIS (THEROPODA, MANIRAPTORA): ANALYZING EVOLUTIONARY TRENDS WITHIN THERIZINOSAUROIDEA
- Lindsay E. Zanno
- 11 September 2006
Analysis of the pectoral girdle and forelimb suggests that Theriz Dinosauridae is more appropriately defined as a derived clade including Nothronychus, Erlicosaurus, Neimongosaurus, Therizinosaurus, and Segnosaurus, and strong support is recovered for a clade containing these five genera plus “Alectrosaurus” and Erliansaurus.