Mattia Tagliavento, Amelia Davies, Miguel Bernecker, Philip Staudigel, Robin R. Dawson, Martin Dietzel, Katja Götschl, Weifu Guo, Anne S. Schulp, François Therrien, Darla K. Zelenitsky, Axel Gerdes, Wolfgang Müller, Jens Fiebig,
... theropod bauplan. Non-avian maniraptoran theropods, such as Troodon , are key to better understand changes in thermophysiology ... nonthermal information recorded in carbonates, to eggshells from Troodon , modern reptiles, and modern birds. Troodon eggshells show variable temperatures, namely 42 and 29 ± ... reveal physiological differences in the reproductive systems between Troodon , reptiles, and birds. Troodon and modern reptiles mineralize their eggshells indistinguishable from ... birds. Lack of disequilibrium patterns in reptile and Troodon eggshells implies these vertebrates had not acquired the ...
Tópico(s): Physiological and biochemical adaptations
2023 - National Academy of Sciences | Proceedings of the National Academy of Sciences
David J. Varricchio, Frankie D. Jackson, Robert A. Jackson, Darla K. Zelenitsky,
... and water vapor conductance across two eggs of Troodon formosus , a small (∼50 kg) theropod dinosaur from ... and surface areas. The 138 × 67 mm idealized Troodon egg has a volume, surface area, and mass ... the strongly asymmetric and elongate form of the Troodon egg. Geometric modeling provides better estimates of volume ... typical bird egg. Porosity varies significantly across both Troodon eggs, with zones 2 and 3 having the ... values favor partial burial and incubation by a Troodon adult. Asymmetric egg shape concentrates volume, surface area, ...
Tópico(s): Amphibian and Reptile Biology
2013 - Cambridge University Press | Paleobiology
David J. Varricchio, Frankie D. Jackson, Clive N. Trueman,
... eggs of the 50 kg-plus theropod dinosaur, Troodon formosus, represents one of the best preserved dinosaur ... actual nest structure and the direct product of Troodon behavior. The trace comes from the Campanian, Late ... role in the post-hatching care of precocial Troodon young. Reproductive traits indicated by MOR 963 show that Troodon possessed plesiomorphies shared with crocodilians (some burial of ... first evolved within non-avian coelurosaurian theropods like Troodon.
Tópico(s): Turtle Biology and Conservation
1999 - Taylor & Francis | Journal of Vertebrate Paleontology
Exceptionally large teeth attributable to the theropod genus Troodon are abundant in Upper Cretaceous rocks (Campanian–Maastrichtian) ... seems to have selected for an abundance of Troodon. The population of these Alaskan specimens— morphologically the ... that the increase in the size of Alaskan Troodon teeth equates to an increase in body size. The increased body size for Alaskan Troodon is likely related to increased availability of food ...
Tópico(s): Ichthyology and Marine Biology
2008 - Society for Sedimentary Geology | Palaios
David J. Varricchio, John R. Horner, Frankie D. Jackson,
... border of the maxillary fenestra permit assignment to Troodon formosus. Most but not all bones appear ossified, ... another indicating synchronous hatching of the clutch. Embryonic Troodon exhibit long distal segments and radically different hindlimb ... Orodromeus and other small vertebrate remains associated with Troodon egg horizons may represent prey of the adults during egg-laying and brooding. Troodon eggs show several aspects either shared or convergent ...
Tópico(s): Turtle Biology and Conservation
2002 - Taylor & Francis | Journal of Vertebrate Paleontology
Yasir Noman Khalid, Muhammad Aleem, Usman Ahmed, Muhammad Arshad Islam, Muhammad Azhar Iqbal,
... a novel load-balancing scheduling heuristic named as Troodon that considers machine-learning based device-suitability model ... a suitable device is also part of the Troodon. Troodon incorporates the E-OSched scheduling mechanism to map ...
Tópico(s): Distributed and Parallel Computing Systems
2019 - Elsevier BV | Journal of Parallel and Distributed Computing
David J. Varricchio, Martin Kundrát, Jason D. Hogan,
... Here we estimate incubation period for the troodontid, Troodon formosus, by examining a near-term embryonic tooth. ... through incubation. Thus, this tooth age suggests a Troodon incubation period of 74 days, falling midway between ... reptilian (107.3 days) values predicted by the Troodon egg mass (314 g). An accelerated incubation relative ... ambient conditions. However, the largely buried condition of Troodon clutches may have prohibited efficient brooding, necessitating longer ...
Tópico(s): Turtle Biology and Conservation
2018 - Nature Portfolio | Scientific Reports
Frankie D. Jackson, John R. Horner, David J. Varricchio,
... egg containing embryonic skeletal elements represents the first Troodon egg collected from the Upper Cretaceous (Campanian) Judith ... earlier ontogenetic stage than similar bones in a Troodon egg from the contemporaneous Two Medicine Formation in ... 3. The presence of three structural layers in Troodon may indicate a deeper origin of an external ...
Tópico(s): Ichthyology and Marine Biology
2009 - Elsevier BV | Cretaceous Research
Lindsay E. Zanno, David J. Varricchio, Patrick M. O’Connor, Alan L. Titus, Michael J. Knell,
... clade remains poor, with only one controversial species—Troodon formosus—presently known from substantial skeletal remains. Methodology/ ... notably smaller than that of the contemporary genus Troodon. Phylogenetic analysis recovers Talos as a member of a derived, latest Cretaceous subclade, minimally containing Troodon, Saurornithoides, and Zanabazar. MicroCT scans reveal extreme pathological ...
Tópico(s): Evolution and Paleontology Studies
2011 - Public Library of Science | PLoS ONE
Anthony R. Fiorillo, Ronald S. Tykoski, Philip J. Currie, Paul J. McCarthy, Peter P. Flaig,
... Cretaceous Prince Creek Formation confirm the presence of Troodon formosus in Alaska. Characters that distinguish one specimen as Troodon formosus include; a very strongly developed sagittal crest ...
Tópico(s): Evolution and Paleontology Studies
2009 - Taylor & Francis | Journal of Vertebrate Paleontology
Mark A. Norell, Peter J. Makovicky, Gabe S. Bever, Amy M. Balanoff, James M. Clark, Ринчен Барсболд, Timothy Rowe,
... between Saurornithoides, Zanabazar, and the North American troodontid Troodon formosus is supported by numerous characters including the ... junior is considerably smaller than that estimated for Troodon formosus, suggesting that the extremely high encephalization quotient of Troodon formosus may be autapomorphic among troodontids.
Tópico(s): Ichthyology and Marine Biology
2009 - American Museum of Natural History | American Museum Novitates
Angélica Torices, Gregory F. Funston, Shannon T. Kraichy, Philip J. Currie,
The systematic position of the small theropod dinosaur Troodon has had a confusing history and has been ... as a lizard, a pachycephalosaurid, and a coelurosaurid. Troodon is now most commonly considered as a sister ... Maniraptora. This study records the first evidence of Troodon in the Danek bonebed, an organic-rich member ...
Tópico(s): Optical measurement and interference techniques
2014 - NRC Research Press | Canadian Journal of Earth Sciences
William J. Freimuth, David J. Varricchio, Alexandria L. Brannick, Lucas N. Weaver, Gregory P. Wilson,
... at the locality favours the non‐avian theropod Troodon formosus as the predator responsible for the regurgitalites, ...
Tópico(s): Ichthyology and Marine Biology
2021 - Wiley | Palaeontology
Peter J. Bishop, Scott Hocknull, Christofer J. Clemente, John R. Hutchinson, Andrew A. Farke, Rod Barrett, David G. Lloyd,
... of extinct, non-avian theropods, Daspletosaurus torosus and Troodon formosus . Observed cancellous bone architectural patterns were linked ... a subvertical femoral orientation, whilst that identified for Troodon was more crouched, but not to the degree ...
Tópico(s): Veterinary Orthopedics and Neurology
2018 - PeerJ, Inc. | PeerJ
Phil Senter, James I. Kirkland, John Bird, Jeff Bartlett,
... unresolved polytomy with Mei, Byronosaurus, Sinornithoides, Sinusonasus, and Troodon+(Saurornithoides+Zanabazar). Geminiraptor suarezarum uniquely exhibits extreme pneumatic ... cross-section. Unlike troodontids more closely related to Troodon, G. suarezarum exhibits bony septa between the dental ...
Tópico(s): Optical measurement and interference techniques
2010 - Public Library of Science | PLoS ONE
Gerald Grellet‐Tinner, Luis M. Chiappe, Mark A. Norell, David J. Bottjer,
... of the oviraptorid Citipati osmolka (Mongolia), the troodontid Troodon formosus (North America), the theropod oospecies Macroelongatoolithus xixiaensis ( ... gradually evolved across more basal theropod clades. Although Troodon formosus by its egg shape and nesting behavior ...
Tópico(s): Evolution and Paleontology Studies
2006 - Elsevier BV | Palaeogeography Palaeoclimatology Palaeoecology
David J. Varricchio, Frankie D. Jackson,
... type, oospecies Prismatoolithus levis, belongs to the theropod Troodon formosus. Although previously described, the presence of a ... exhibits a cuticle layer and the eggs of Troodon are asymmetric. Cladistic analysis of 14 fossil and ...
Tópico(s): Evolution and Paleontology Studies
2004 - Taylor & Francis | Journal of Vertebrate Paleontology
Anthony R. Fiorillo, Roland A. Gangloff,
... in south-central Montana, the teeth assigned to Troodon dominated the Alaskan assemblage. The dominance of Troodon is attributed to adaptation by this theropod to ...
Tópico(s): Ichthyology and Marine Biology
2001 - Taylor & Francis | Journal of Vertebrate Paleontology
... iguanodontoids, Hypacrosaurus, Prosaurolophus, and Gryposaurus, and the theropod Troodon. Associated individuals of these taxa have non-random ... and/or event mortality. The four or more Troodon represent the first described multi-individual troodontid occurrence. ...
Tópico(s): Pleistocene-Era Hominins and Archaeology
1995 - Elsevier BV | Palaeogeography Palaeoclimatology Palaeoecology
A new, well-preserved specimen of Troodon formosus is the first to reveal the internal anatomy of the lower part of the braincase. In addition to providing new information ... systems found in bird skulls are present in Troodon. The anterior tympanic recess is the most elaborate ...
Tópico(s): Evolution and Paleontology Studies
1993 - NRC Research Press | Canadian Journal of Earth Sciences
... metatarsals and two tibiae of differing sizes from Troodon formosus was examined. Bone in T. formosus passed ...
Tópico(s): Amphibian and Reptile Biology
1993 - Taylor & Francis | Journal of Vertebrate Paleontology
... beneath each serration. In contrast, the carnivorous dinosaur Troodon has teeth with exposed pointed serrations, thin enamel, ... possibly serration roots. Serrations on the teeth of Troodon and the fossil shark Carcharodon, cut compliant materials ...
Tópico(s): Evolution and Paleontology Studies
1992 - Cambridge University Press | Paleobiology
... hatchlings. The third morphotype probably belongs to a ?Troodon, based on contained embryonic remains. A very small ... the structural morphotypes described for Orodromeus, Maiasaura, and ?Troodon also dominate here. In addition, an isolated, gecko- ...
Tópico(s): Avian ecology and behavior
1990 - Taylor & Francis | Journal of Vertebrate Paleontology
... examination of all jaws and teeth attributed to Troodon, Stenonychosaurus, and Pectinodon. It is concluded that Troodon is the senior synonym of these genera, and ...
Tópico(s): Ichthyology and Marine Biology
1987 - Taylor & Francis | Journal of Vertebrate Paleontology
Renfei Feng, Jason Maley, G. Schatte, Ruth E. Hoffmeyer, Kirstin S. Brink, Thomas Sayers Ellis, Donald B. Brinkman, Ramaswami Sammynaiken,
... nature of the enamel of a tooth from Troodon, a small theropod dinosaur. These methods show that the crystallites in the Troodon tooth are submicron-sized carbonated calcium hydroxyapatite, which ... Comparison of the ESR spectra indicates that the Troodon tooth had less exposure to UV than a ...
Tópico(s): Pleistocene-Era Hominins and Archaeology
2016 - SAGE Publishing | Applied Spectroscopy
David C. Evans, Caleb M. Brown, Hai‐Lu You, Nicolás E. Campione,
... recorded pachycephalosaurid dinosaur from outside of North America, “Troodon” bexelli, was described from the Upper Cretaceous of ... Sinocephale bexelli is phylogenetically removed from Stegoceras (formerly “Troodon”), to which it was previously affiliated, and recovered ...
Tópico(s): Ichthyology and Marine Biology
2021 - NRC Research Press | Canadian Journal of Earth Sciences
Jason D. Hogan, David J. Varricchio,
Abstract Troodon formosus , a theropod from the Late Cretaceous, is one of the few species of dinosaurs with multiple ... in modern vertebrates. There has been debate over Troodon 's capacity to engage in thermoregulatory contact incubation, ...
Tópico(s): Amphibian and Reptile Biology
2020 - Cambridge University Press | Paleobiology
(1933). XXIX.—Relationships and habitat of Troodon and the Nodosaurs. Annals and Magazine of Natural History: Vol. 11, No. 62, pp. 231-235.
Tópico(s): Ecology and biodiversity studies
1933 - Taylor & Francis | Annals and Magazine of Natural History
... are using LibSys and two use Virtua and Troodon for their LMS. Virtua covers most of the ... although the compliance of standards is limited, but Troodon is lagging behind. Originality/value The recommended attributes ...
Tópico(s): QR Code Applications and Technologies
2011 - Emerald Publishing Limited | Program electronic library and information systems
Alfio Alessandro Chiarenza, Anthony R. Fiorillo, Ronald S. Tykoski, Paul J. McCarthy, Peter P. Flaig, Dori L. Contreras,
... known can be attributed to the troodontid cf. Troodon and the tyrannosaurid Nanuqsaurus. Thus far, the presence ...
Tópico(s): Ichthyology and Marine Biology
2020 - Public Library of Science | PLoS ONE