A large Compsognathid from the early cretaceous Yixian formation of China

  title={A large Compsognathid from the early cretaceous Yixian formation of China},
  author={Sunny H. Hwang and Mark A. Norell and Ji Qiang and Gao Ke-Qin},
  journal={Journal of Systematic Palaeontology},
  pages={13 - 30}
Synopsis A new, large compsognathid theropod, Huaxiagnathus orientalis gen. et sp. nov., from the Early Cretaceous Yixian Formation deposits of Liaoning Province, People's Republic of China is described. The holotype specimen is nearly complete, lacking only the distal portion of the tail. It is the second largest theropod taxon discovered from Jehol Group sediments. Like all compsognathids, Huaxiagnathus has short forelimbs and a relatively unspecialised coelurosaur body plan. Previously… 

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

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,

A new caudipterid from the Lower Cretaceous of China with information on the evolution of the manus of Oviraptorosauria

A new caudipterid species Xingtianosaurus ganqi is described, providing new morphological information on early manual evolution of Oviraptorosauria, and giving new light on the evolution of radiale angle among Coelurosauria.

The systematic position of the enigmatic theropod dinosaur Yixianosaurus longimanus

The hypothesis that Y. longimanus is a basal paravian is consistent with the probable presence of pennaceous feathers in this taxon, and avoids implying a complicated evolutionary history for the maniraptoran forelimb.

A Basal Coelurosaur (Dinosauria: Theropoda) from the Late Jurassic (Oxfordian) of the Shishugou Formation in Wucaiwan, People's Republic of China

A cladistic analysis of Zuolong salleei in a broadly sampled theropod data matrix recovers it as a basal coelurosaur, making it one of the oldest coel Kurosaur fossils yet known that preserves both cranial and postcranial bones.

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

The osteology and affinities of Eotyrannus lengi, a tyrannosauroid theropod from the Wealden Supergroup of southern England

The analysis supports the inclusion of Megaraptora within Tyrannosauroidea and thus increases Cretaceous tyrannosauroid diversity and disparity and supports a proposal that Eotyrannus might belong within Megarptora, however, is based on character states not present in the taxon.

A New Genus and Species of Sapeornithidae from Lower Cretaceous in Western Liaoning, China

Sapeornithidae is a basal pygostylian family of Early Cretaceous primitive birds, in which only one genus and species, Sapeornis chaoyangensis, was reported before, but according to the phylogenetic analyses, both Didactylornis gen. nov. and SapeORNis form a sister group, which is basal to the clade formed by Confuciusornis and all the more derived birds.

A new carnivorous dinosaur from the Late Jurassic Solnhofen archipelago

A cladistic analysis indicates that the new theropod dinosaur described from the Late Jurassic period of Schamhaupten in southern Germany is closer to maniraptorans than to tyrannosauroids, grouping it with taxa often considered to be compsognathids.

A juvenile specimen of a new coelurosaur (Dinosauria: Theropoda) from the Middle–Late Jurassic Shishugou Formation of Xinjiang, People's Republic of China

It is shown that the phylogenetic position of Aorun as a member of Coelurosauria is robust to the exclusion of characters known to change during theropod ontogeny.



Anatomy of Sinosauropteryx prima from Liaoning, northeastern China

A spectacular pair of Sinosauropteryx skeletons from Jurassic–Cretaceous strata of Liaoning in northeastern China attracted worldwide notoriety in 1996 as the first dinosaurs covered with

Cretaceous age for the feathered dinosaurs of Liaoning, China

The results of this dating study indicate that the lower Yixian fossil horizons are not Jurassic but rather are at least 20 Myr younger, placing them within middle Early Cretaceous time.

A dromaeosaurid dinosaur with a filamentous integument from the Yixian Formation of China

Phylogenetic analysis indicates that, among known theropods with integumentary filaments or feathers, Dromaeosauridae is the most bird-like, and is more closely related to birds than is Troodontidae.

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.

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.


  • T. Holtz
  • Environmental Science, Geography
  • 2001
The last several years have seen the discovery of many new theropod dinosaur taxa. Data obtained from these and from fragmentary forms not previously utilized in cladistic analyses are examined. An


Abstract We report the well preserved skeleton of a small theropod dinosaur, Nqwebasaurus thwazi, gen. et sp. nov., from the Lower Cretaceous Kirkwood Formation of South Africa. Nqwebasaurus has an

Mesozoic Birds: Above the Heads of Dinosaurs

Preface Part I: The Archosaurian Heritage of Birds 1. The Debate on Avian Ancestry: Phylogeny, Function, and Fossils LAWRENCE M. WITMER 2. Cladistic Approaches to the Relationships of Birds to Other

A therizinosauroid dinosaur with integumentary structures from China

This new taxon from the Yixian Formation provides fresh evidence that therizinosauroids are nested within the coelurosaurian theropods, and supports the hypothesis that the filamentous integumentary structures may be homologous to the feathers of birds.