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Predatory Dinosaurs from the Sahara and Late Cretaceous Faunal Differentiation
Late Cretaceous (Cenomanian) fossils discovered in the Kem Kem region of Morocco include large predatory dinosaurs that inhabited Africa as it drifted into geographic isolation. One, represented by a
Evidence for Avian Intrathoracic Air Sacs in a New Predatory Dinosaur from Argentina
TLDR
A new predatory dinosaur from Upper Cretaceous rocks in Argentina is described that exhibits extreme pneumatization of skeletal bone, including pneumatic hollowing of the furcula and ilium, and several pneumatized gastralia are described, which suggest that diverticulae of the air sac system were present in surface tissues of the thorax.
Nest and egg clutches of the dinosaur Troodon formosus and the evolution of avian reproductive traits
TLDR
Non-avian coelurosaurians possess several primitive features found in crocodilians and several derived features shared with birds (relatively larger and potentially asymmetric eggs, one egg produced per oviduct at a time, loss of egg retention, open nests, brooding).
A New Troodontid Theropod, Talos sampsoni gen. et sp. nov., from the Upper Cretaceous Western Interior Basin of North America
TLDR
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.
EMBRYOS AND EGGS FOR THE CRETACEOUS THEROPOD DINOSAUR TROODON FORMOSUS
TLDR
Elongate and asymmetric eggs of the oospecies Prismatoolithus levis occur regularly in the Upper Cretaceous Two Medicine Formation of western Montana and show several aspects either shared or convergent with some birds, and further demonstrate the close relationship of Troodontidae and Aves.
First trace and body fossil evidence of a burrowing, denning dinosaur
TLDR
Burrowing habits expand the known range of nonavian dinosaur behaviours and suggest that the cursorial ancestry of dinosaurs did not fully preclude the evolution of different functional regimes, such as fossoriality.
Anatomy of the Early Cretaceous Bird Rapaxavis Pani, A New Species From Liaoning Province, China
TLDR
A comparison of the proportions of the pedal phalanges of Rapaxavis to modern birds shows the longirostrine enantiornithean taxon to be highly adapted to a grasping, arboreal lifestyle.
An integrative approach to understanding bird origins
TLDR
Recent discoveries of spectacular dinosaur fossils overwhelmingly support the hypothesis that birds are descended from maniraptoran theropod dinosaurs, and furthermore, demonstrate that distinctive bird characteristics such as feathers, flight, endothermic physiology, unique strategies for reproduction and growth, and a novel pulmonary system originated among Mesozoic terrestrial dinosaurs.
Marine transgressions and the evolution of Cretaceous dinosaurs
FLUCTUATIONS (transgressions and regressions) of intercon-tinental sea-ways during the Mesozoic Era affected the habitat area of coastal plains by alternately restricting the space during
Avian Paternal Care Had Dinosaur Origin
TLDR
Paternal care in both troodontids and oviraptorids indicates that this care system evolved before the emergence of birds and represents birds' ancestral condition.
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