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

  title={New Specimens of Microraptor zhaoianus (Theropoda: Dromaeosauridae) from Northeastern China},
  author={Sunny H. Hwang and Mark A. Norell and Ji Qiang and Gao Keqin},
Abstract New specimens of the diminutive theropod dinosaur Microraptor zhaoianus are described. These specimens preserve significant morphological details that are not present or are poorly preserved in the holotype specimen, including aspects of the manus, pectoral girdle, dorsal vertebrae, ilium, and sacrum. These specimens were coded into a current matrix of theropod morphological characters. Microraptor is found to be the sister taxon to other dromaeosaurs. Dromaeosaurids are monophyletic… 

A New Specimen of Microraptor (Theropoda: Dromaeosauridae) from the Lower Cretaceous of Western Liaoning, China

The morphology of the rib cage suggests Microraptor and the early volant avialans very likely may have shared a similar mechanism to assist respiration and support the close relationship of troodontids and dromaeosaurids (Deinonychosauria).

Unenlagiid theropods: are they members of the Dromaeosauridae (Theropoda, Maniraptora)?

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  • Biology, Environmental Science
    Anais da Academia Brasileira de Ciencias
  • 2011
The phylogenetic position of the derived Gondwanan theropod clade Unenlagiidae is analyzed, retrieves a monophyletic Avialae formed by UnenLagiidae plus Aves, and produces significant changes in the topological distribution within Deinonychosauria.

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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.

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
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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,

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A Troodontid Dinosaur from Ukhaa Tolgod (Late Cretaceous Mongolia)

A fragmentary troodontid specimen from the sublocality of Grangers Flats at the Late Cretaceous locality of Ukhaa Tolgod, Omnogov, Mongolia displays a pattern of tooth replacement like that of basal avialans, used by some to refute a theropod origin for this group.

The First Non-Avian Theropod from the Czech Republic

All currently known theropod specimens from the Czech Republic have been attributed to the crown clade Aves. However, an archosaur tooth in the Institute of Geological Sciences (Faculty of Science,



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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.

Remarkable New Birdlike Dinosaur (Theropoda: Maniraptora) from the Upper Cretaceous of Montana

.i.bstmrt.-'v\'t: describe a small drmnaeosauricl dillosaur, BambimjJtorjtinberr;i n. gt:n. and n. sp.. bast'd upon a nearly complt:te fossil skeleton from the Two \ledicine Formation (Upper

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A rerun of Bryant and Russell's (1993) congruence test was conducted against a new and larger tree reflecting new ideas about theropod phylogeny, and results more consistently show that clavicles are primitively present in theropods.

A basal troodontid from the Early Cretaceous of China

The discovery of Sinovenator and the examination of character distributions along the maniraptoran lineage indicate that principal structural modifications toward avians were acquired in the early stages of manIRaptoran evolution.

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.

Bird-like characteristics of the jaws and teeth of troodontid theropods (Dinosauria, Saurischia)

A critical examination of all jaws and teeth attributed to Troodon, Stenonychosaurus, and Pectinodon concluded that Troodon is the senior synonym of these genera, and that the name Troodontidae has priority over Saurornithoididae.

The evolution of dinosaurs.

  • P. Sereno
  • Environmental Science, Geography
  • 1999
The ascendancy of dinosaurs on land near the close of the Triassic now appears to have been as accidental and opportunistic as their demise and replacement by therian mammals at the end of the

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.

A New Specimen of Archaeopteryx

A new specimen of the primordial bird Archaeopteryx is reported from the Upper Jurassic Solnhofen Limestone of Bavaria, which is the largest of now six skeletal specimens and shows dose similarities with the London specimen.

The distribution of integumentary structures in a feathered dinosaur

An enigmatic small theropod dinosaur is reported on that is covered with filamentous feather-like structures over its entire body.