A Small Derived Theropod from Öösh, Early Cretaceous, Baykhangor Mongolia

  title={A Small Derived Theropod from {\"O}{\"o}sh, Early Cretaceous, Baykhangor Mongolia},
  author={Alan H. Turner and Sunny H. Hwang and Mark A. Norell},
Abstract A new theropod dinosaur, Shanag ashile, from the Early Cretaceous Öösh deposits of Mongolia is described here. The new specimen (IGM 100/1119) comprises a well-preserved right maxilla, dentary, and partial splenial. This specimen exhibits a number of derived theropod features, including a triangular anteriorly tapering maxilla, a large antorbital fossa, and maxillary participation in the caudally elongate external nares. These features resemble the Early Cretaceous dromaeosaurids… 

A new dromaeosaurid (Dinosauria: Theropoda) from the Upper Cretaceous Wulansuhai Formation of Inner Mongolia, China

A number of cranial and dental features seen in L. exquisitus and T. mangas suggest that these two taxa are probably intermediate in systematic position between known basal and derived dromaeosaurids, and the discovery of Linheraptor exquis Titus is thus important for understanding the evolution of some salient feature seen in the derived dronaeosaurusids.

A New Dromaeosaurid Theropod from Ukhaa Tolgod (Ömnögov, Mongolia)

A new dromaeosaurid theropod from the Upper Cretaceous Djadokhta Formation of Ukhaa Tolgod, Mongolia is described, with a well-preserved skull and cervical series and a jugal–squamosal contact that excludes the postorbital from the margin of the infratemporal fenestra.

A New Dromaeosaurid (Dinosauria: Coelurosauria) from Khulsan, Central Mongolia

A new species of dromaeosaurid—Kuru kulla, gen. et sp. nov.—based on a partial skeleton from the Late Cretaceous Khulsan locality (Barun Goyot Formation) of Mongolia is described, characterized by a unique combination of characters, including a mediolaterally narrow metatarsal II and a lacrimal with a poorly developed boss on its lateral surface.

A new microraptorine theropod from the Jehol Biota and growth in early dromaeosaurids

Comparison of histology in the new taxon and Sinornithosaurus indicates that macroscopic signs of maturity developed after the first year, but before cessation of growth, demonstrating that nonhistological indicators of adulthood may be misleading when applied to dromaeosaurids.

New Dromaeosaurids (Dinosauria: Theropoda) from the Lower Cretaceous of Utah, and the Evolution of the Dromaeosaurid Tail

A phylogenetic analysis places Y. doellingi in a clade with Utahraptor, Achillobator, and Dromaeosaurus and traces changes in character states of the tail across Coelurosauria to elucidate the evolution of the dromaeosaurid tail.

Theropod dinosaurs from the Albian–Cenomanian Wayan Formation of eastern Idaho

Abstract The record of terrestrial vertebrates in the upper Albian to Cenomanian Wayan Formation of Idaho is sparse, with most fossils recovered belonging to the small orodromine neornithischian

A diminutive deinonychosaur (Dinosauria: Theropoda) from the Early Cretaceous of Öösh (Övörkhangai, Mongolia)

The finding of a new small theropod specimen in the Öösh Formation adds to the deinonychosaur fossil record from the same beds, until now restricted to the dromaeosaurid Shanag ashile.

Theropod teeth from the basalmost Cretaceous of Anoual (Morocco) and their palaeobiogeographical significance

Abstract The theropod teeth from the Berriasian (Early Cretaceous) site of Anoual (N Morocco) are described. The assemblage is important in that it comes from one of the very few dinosaur sites of

A microraptorine (Dinosauria–Dromaeosauridae) from the Late Cretaceous of North America

  • N. LongrichP. Currie
  • Environmental Science, Geography
    Proceedings of the National Academy of Sciences
  • 2009
Hesperonychus is the youngest known member of this lineage, extending the temporal range of the clade by 45 million years, and it is the first microraptorine known from North America, providing further evidence for an affinity between the dinosaur faunas of North America and Asia.

The first dromaeosaurid (Dinosauria: Theropoda) from the Lower Cretaceous Bayan Gobi Formation of Nei Mongol, China

The first dromaeosaurid theropod from the Lower Cretaceous Bayan Gobi Formation is identified based on an incompletely preserved partially-articulated left leg, increasing the known diversity of its



A new carnosaur (Dinosauria, Theropoda) from the Jurassic of Xinjiang, People's Republic of China

In 1987, a Sino-Canadian expedition known as the Dinosaur Project (China – Canada – Alberta – Ex Terra) discovered a large theropod skeleton in the Upper Jurassic Shishugou Formation of the Junggar

Anatomy and phylogenetic relationships of the theropod dinosaur Microvenator celer from the Lower Cretaceous of Montana. American Museum novitates ; no. 3240

Reexamination of the holotype revealed the presence of several autapomorphies that provide the basis for a revised diagnosis of Microvenator celer, the earliest known oviraptorosaurian or ovarian theropod represented by diagnostic skeletal remains.

A large Compsognathid from the early cretaceous Yixian formation of China

A new, large compsognathid theropod from the Early Cretaceous Yixian Formation deposits of Liaoning Province, People's Republic of China is described and the phylogenetic position of Huaxiagnathus orientalis fell out at the base of the Compso‐gnathidae, as it lacks the forelimb adaptations of more derived comps Cognathids.

New information on the anatomy and relationships of Dromaeosaurus albertensis (Dinosauria: Theropoda)

Repreparation and restudy of the holotype of Dromaeosaurus albertensis has produced new anatomical information useful for evaluating the relationships of dromaeosaurids.

The Skull of Erlicosaurus andrewsi , a Late Cretaceus " Segnosaur " ( Theropoda : Therizinosauridae ) from Mongolial

The holotype of Erlicosaurus andrewsi Perle, 1981, from Late Cretaceous strata at Baynshin Tsav, South Gobi Aimak, Mongolia, includes an exceptionally well-preserved, nearly complete skull and

The Morphology and Phylogenetic Position of Apsaravis ukhaana from the Late Cretaceous of Mongolia

The implications of Apsaravis ukhaana, and the results of the phylogenetic analysis, for the evolution of flight after its origin and character support for enantiornithine monophyly are extensively discussed.

Cranial anatomy of Stenonychosaurus inequalis (Saurischia, Theropoda) and its bearing on the origin of birds

The middle ear cavity is well defined and is connected to at least two systems of sinuses in the skull bones, which strengthen the claim that small carnivorous dinosaurs are more plausible bird ancestors than either pseudosuchians or crocodiles.

Cranial morphology of Sinornithosaurus millenii Xu et al. 1999 (Dinosauria: Theropoda: Dromaeosauridae) from the Yixian Formation of Liaoning, China

The recent discovery of the early dromaeosaurid Sinornithosaurus millenii Xu et al. 1999 is especially important for our understanding of maniraptoran evolution, particularly of avian origins. This

New Specimens of Microraptor zhaoianus (Theropoda: Dromaeosauridae) from Northeastern China

New specimens of the diminutive theropod dinosaur Microraptor zhaoianus are described, found to be the sister taxon to other dromaeosaurs and apparently small size is primitive for Deinonychosauria, which has implications for bird origins.