A bizarre Cretaceous theropod dinosaur from Patagonia and the evolution of Gondwanan dromaeosaurids

  title={A bizarre Cretaceous theropod dinosaur from Patagonia and the evolution of Gondwanan dromaeosaurids},
  author={Fernando E Novas and Diego Pol and Juan Ignacio Canale and Juan D. Porfiri and Jorge O Calvo},
  journal={Proceedings of the Royal Society B: Biological Sciences},
  pages={1101 - 1107}
  • F. NovasD. Pol J. Calvo
  • Published 22 March 2009
  • Geography, Environmental Science
  • Proceedings of the Royal Society B: Biological Sciences
Fossils of a predatory dinosaur provide novel information about the evolution of unenlagiines, a poorly known group of dromaeosaurid theropods from Gondwana. The new dinosaur is the largest dromaeosaurid yet discovered in the Southern Hemisphere and depicts bizarre cranial and postcranial features. Its long and low snout bears numerous, small-sized conical teeth, a condition resembling spinosaurid theropods. Its short forearms depart from the characteristically long-armed condition of all… 

Figures and Tables from this paper

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.

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.

Megaraptorid (Theropoda: Tetanurae) Partial Skeletons from the Upper Cretaceous Bajo Barreal Formation of Central Patagonia, Argentina: Implications for the Evolution of Large Body Size in Gondwanan MegaraptoranS

ABSTRACT We describe two partial postcranial skeletons belonging to the enigmatic theropod dinosaur clade Megaraptoridae from the Upper Cretaceous (lower Cenomanian–upper Turonian) Bajo Barreal

The Osteology of Balaur bondoc, an Island-Dwelling Dromaeosaurid (Dinosauria: Theropoda) from the Late Cretaceous of Romania

ABSTRACT The Haţeg Island fauna of the terminal Late Cretaceous (ca. 71–65 million years ago) of Romania is one of the most unusual dinosaur assemblages in the global fossil record. It has long been

A bony-crested Jurassic dinosaur with evidence of iridescent plumage highlights complexity in early paravian evolution

A distinctive new Yanliao theropod species bearing prominent lacrimal crests, bony ornaments previously known from more basal theropods, and a suite of unusual skeletal and feather characteristics consistent with proposed rapid character evolution and significant diversity in signalling and locomotor strategies near bird origins.

A giant dromaeosaurid theropod from the Upper Cretaceous (Turonian) Bissekty Formation of Uzbekistan and the status of Ulughbegsaurus uzbekistanensis

The Upper Cretaceous (Turonian) Bissekty Formation of Uzbekistan has yielded many isolated bones and teeth representing a variety of non-avian theropod dinosaurs. A pedal phalanx II-2 indicates the

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.

New Patagonian Cretaceous theropod sheds light about the early radiation of Coelurosauria

Bicentenaria amplifies the array of basal coelurosaurs that inhabited Gondwana during the Cretaceous, also including compsognathids, Aniksosaurus and Santanaraptor, and reveals the importance of the new taxon in the understanding of the early diversification of Coelurosauria.

An aberrant island-dwelling theropod dinosaur from the Late Cretaceous of Romania

A new dromaeosaurid theropod is described, based on an articulated skeleton from the Maastrichtian of Romania, which represents the most complete predatory dinosaur from the middle to Late Cretaceous of Europe and indicates that predators on these islands were not necessarily small, geographically endemic, or primitive.



New evidence on deinonychosaurian dinosaurs from the Late Cretaceous of Patagonia

A new, Late Cretaceous member of the clade, Neuquenraptor argentinus gen. et sp.

On a new maniraptoran dinosaur (Theropoda) from the upper Cretaceous of Neuquen, Patagonia, Argentina

3 ABSTRACT: The "Futalognko" site, situated at the margins of the Los Barreales lake about 90 km northwest of Neuquen city (Patagonia), revealed several new dinosaur specimens, all from the

New evidence concerning avian origins from the Late Cretaceous of Patagonia

A theropod dinosaur from Patagonia is described, Unenlagia comahuensis gen. et sp.

The smallest known non-avian theropod dinosaur

This is the first mature non-avian dinosaur to be found that is smaller than Archaeopteryx, and it eliminates the size disparity between the earliest birds and their closest non-Avian theropod relatives.


Abstract The holotype of Irritator challengeri Martill et al., 1996 from the Romualdo Member of the Santana Formation (Lower Cretaceous) in northeastern Brazil represents the most complete skull of a

The theropod ancestry of birds: new evidence from the late cretaceous of madagascar

Rahona has a robust, hyperextendible second digit on the hind foot that terminates in a sicklelike claw, a unique characteristic of the theropod groups Troodontidae and Dromaeosauridae.

A Basal Dromaeosaurid and Size Evolution Preceding Avian Flight

Change in theropod body size leading to flight's origin was not unidirectional, and the two dinosaurian lineages most closely related to birds, dromaeosaurids and troodontids, underwent four independent events of gigantism, and in some lineages size increased by nearly three orders of magnitude.

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

Quilmesaurus curriei Coria, 2001 (Dinosauria, Theropoda). Su validez taxonómica y relaciones filogenéticas

On the basis of the available evidence, it is not possible to identify autapomorphic characters that allow validating Quilmesaurus curriei, and for this reason it is considered to belong to Abelisauridae, and it is possibly a member of Carnotaurinae.