Cranial pneumatic anatomy of<i>Ornithomimus edmontonicus</i>(Ornithomimidae: Theropoda)

Tahara, Rui

doi:10.1080/02724634.2011.539646

Cited by 31 publications

(93 citation statements)

References 66 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The basioccipital is not invaded by a subcondylar recess: the interior of this bone is solid, and there are no large pneumatic foramina ventrolateral to the occipital condyle. This recess is characteristic of derived tyrannosaurids (20,26) and other coelurosaurs (27), but is absent in Xiongguanlong (14) and other basal tyrannosauroids (2,20). As in most theropods, there is a deep basisphenoid recess on the ventral surface.…”

Section: Description and Comparisonsmentioning

confidence: 91%

“…Only coelurosaurs possess such extensive recesses (20,27), as outgroups have either a tiny sinus penetrating the anterior edge of the paroccipital process (28) or lack a recess in this region altogether (29,30). There is a deep fossa on the posterior surface of each paroccipital process, lateral to the foramen magnum, as in basal tyrannosauroids such as Guanlong and Dilong but not in tyrannosaurids (2,20).…”

Section: Description and Comparisonsmentioning

confidence: 99%

See 1 more Smart Citation

New tyrannosaur from the mid-Cretaceous of Uzbekistan clarifies evolution of giant body sizes and advanced senses in tyrant dinosaurs

Brusatte

Averianov

Sues

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

View full text Add to dashboard Cite

Tyrannosaurids-the familiar group of carnivorous dinosaurs including Tyrannosaurus and Albertosaurus-were the apex predators in continental ecosystems in Asia and North America during the latest Cretaceous (ca. 80-66 million years ago). Their colossal sizes and keen senses are considered key to their evolutionary and ecological success, but little is known about how these features developed as tyrannosaurids evolved from smaller basal tyrannosauroids that first appeared in the fossil record in the Middle Jurassic (ca. 170 million years ago). This is largely because of a frustrating 20+ millionyear gap in the mid-Cretaceous fossil record, when tyrannosauroids transitioned from small-bodied hunters to gigantic apex predators but from which no diagnostic specimens are known. We describe the first distinct tyrannosauroid species from this gap, based on a highly derived braincase and a variety of other skeletal elements from the Turonian (ca. 90-92 million years ago) of Uzbekistan. This taxon is phylogenetically intermediate between the oldest basal tyrannosauroids and the latest Cretaceous forms. It had yet to develop the giant size and extensive cranial pneumaticity of T. rex and kin but does possess the highly derived brain and inner ear characteristic of the latest Cretaceous species. Tyrannosauroids apparently developed huge size rapidly during the latest Cretaceous, and their success in the top predator role may have been enabled by their brain and keen senses that first evolved at smaller body size.dinosaur | Tyrannosauroidea | Uzbekistan | phylogenetics | evolution

show abstract

Section: Description and Comparisonsmentioning

confidence: 91%

Section: Description and Comparisonsmentioning

confidence: 99%

New tyrannosaur from the mid-Cretaceous of Uzbekistan clarifies evolution of giant body sizes and advanced senses in tyrant dinosaurs

Brusatte

Averianov

Sues

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

View full text Add to dashboard Cite

show abstract

“…2B). Its presence is plesiomorphic for tyrannosauroids and is retained in all known tyrannosauroid taxa including Guanlong, although in this taxon, as in many other theropods (e.g., ornithomimosaurs; Makovicky and Norell, 1998;Tahara and Larsson, 2011), the fossa widens caudally rather than exhibiting the ovoid or circular shape present in IGM 100/1844. The fossa of Guanlong and many other coelurosaurs (e.g., Kurzanov, 1976;Currie, 1995;Makovicky and Norell, 1998;Kirkland et al, 2005;Norell et al, 2006) also differs from the seemingly derived tyrannosaurid condition (e.g., IGM 100/ 1844, Albertosaurus, Alioramus remotus, Bisahieversor, Daspletosaurus, Gorgosaurus) in opening ventrally and being obscured in caudal view rather than opening caudoventrally and being visible in caudal view.…”

Section: Pneumatic Recesses and Cavitiesmentioning

confidence: 99%

“…The origins of these spaces are divided between diverticula of the tympanic, median pharyngeal, and subcondylar sinuses (Russell, 1970;Bakker et al, 1988;Molnar, 1991;Witmer, 1997;Brochu, 2003;Rauhut, 2004;Ridgely, 2009, 2010). All tyrannosauroids lack the subotic recess of ornithomimosaurs and some troodontids (Currie, 1985;Makovicky and Norell, 1998;Makovicky et al, 2003;Xu et al, 2002;Tahara and Larsson, 2011) with the possible exception of Teratophoneus (Carr et al, 2011). Additionally, the pneumatic recess that excavates the lateral surface of the cultriform process above the basipterygoid recess and ventral to the pituitary fossa region in some troodontids (Xu et al, 2002) and the basal dromaeosaurid Sinornithosaurus (Xu and Wu, 2000) is absent.…”

Section: Pneumatic Recesses and Cavitiesmentioning

confidence: 99%

“…The recess, which is present in most coelurosaurs, but is absent outside of this group (Witmer, 1990(Witmer, , 1997Brusatte and Sereno, 2007;Sampson and Witmer, 2007;Brusatte et al, 2010b;Tahara and Larsson, 2011), is pierced by a foramen set caudolateral to the stapedial recess (in the base of the paroccipital process) and opens into the caudal tympanic cavity ( fig. 20).…”

Section: Pneumatic Recesses and Cavitiesmentioning

confidence: 99%

See 1 more Smart Citation

The Braincase Anatomy of the Late Cretaceous DinosaurAlioramus(Theropoda: Tyrannosauroidea)

Bever

Brusatte

Carr

et al. 2013

Bulletin of the American Museum of Natural History

115

View full text Add to dashboard Cite

Skull Anatomy and Pneumaticity of the Enigmatic Coelurosaurian Theropod Bicentenaria argentina.

Rolando

Cerroni

Novas

2019

The Anatomical Record

View full text Add to dashboard Cite

The enigmatic basal coelurosaur Bicentenaria argentina is a small theropod that comes from the Upper Cretaceous of Patagonia. It is constituted by more than 130 elements, including cranial remains. These are represented by an incomplete snout, palate, dermatocranium, and lower jaws still in articulation. The skull material of Bicentenaria was preliminarily studied by previous authors. In this study, we conducted a CT scan of the holotype of Bicentenaria, which allowed us to fully describe all preserved skull bones, including some previously unknown elements. The morphological analysis indicates that Bicentenaria shares many cranial features with other basal coelurosaurs as compsognathids, Ornitholestes, and tyrannosauroids. Otherwise, results of this analysis show that Bicentenaria exhibits a set of traits unique to this taxon. Furthermore, several pneumatic recesses were closely matched with those pneumatic features present in many derived coelurosaurs, particularly tyrannosauroids. This new information, together with future discoveries, will improve our knowledge about the muscular correlates of Bicentenaria and other coelurosaurs, and may shed light about the phylogenetic relationships of this group. Anat Rec, 2019. © 2019 American Association for Anatomy Anat Rec, 303:1884–1900, 2020. © 2019 American Association for Anatomy

show abstract

Cranial pneumatic anatomy ofOrnithomimus edmontonicus(Ornithomimidae: Theropoda)

Cited by 31 publications

References 66 publications

New tyrannosaur from the mid-Cretaceous of Uzbekistan clarifies evolution of giant body sizes and advanced senses in tyrant dinosaurs

New tyrannosaur from the mid-Cretaceous of Uzbekistan clarifies evolution of giant body sizes and advanced senses in tyrant dinosaurs

The Braincase Anatomy of the Late Cretaceous DinosaurAlioramus(Theropoda: Tyrannosauroidea)

Skull Anatomy and Pneumaticity of the Enigmatic Coelurosaurian Theropod Bicentenaria argentina.

Contact Info

Product

Resources

About