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Updated: Feb 5, 2026

Transforming, Genome Editing and Phenotyping the Nitrogen-fixing Tropical Cannabaceae Tree Parasponia andersonii
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Evolution: New Branches on the Alvarezsaur Tree.

Thomas R Holtz1

  • 1Department of Geology, University of Maryland, 8000 Regents Drive, College Park, MD 20742, USA; Department of Paleobiology, National Museum of Natural History, Smithsonian Institution, Washington, DC 20013, USA.

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|September 12, 2018
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Summary
This summary is machine-generated.

Two new dinosaur species from China reveal unknown evolutionary steps. These mid-Cretaceous fossils bridge the gap between early Jurassic carnivores and later insectivorous alvarezsaurids.

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Area of Science:

  • Paleontology
  • Evolutionary Biology
  • Vertebrate Zoology

Background:

  • The evolutionary history of theropod dinosaurs, particularly the lineage leading to alvarezsaurids, remains incompletely understood.
  • Primitive Jurassic carnivores represent an early stage in theropod evolution.
  • Late Cretaceous alvarezsaurids exhibit unique insectivorous specializations.

Purpose of the Study:

  • To describe two new dinosaur species from the mid-Cretaceous period in China.
  • To elucidate previously unknown stages in the evolutionary transition from early theropods to alvarezsaurids.
  • To provide new fossil evidence for dinosaur evolution during the Cretaceous.

Main Methods:

  • Field excavation and discovery of fossil remains.
  • Comparative anatomical analysis of skeletal structures.
  • Phylogenetic bracketing to infer evolutionary relationships.

Main Results:

  • Discovery of two new dinosaur species from the mid-Cretaceous of China.
  • Fossil evidence documents intermediate morphological features between Jurassic carnivores and Late Cretaceous alvarezsaurids.
  • These species represent previously unrecognized transitional forms.

Conclusions:

  • The new species fill a critical gap in the fossil record of alvarezsaurid evolution.
  • These findings enhance our understanding of theropod dinosaur diversification and adaptation.
  • The mid-Cretaceous Chinese fauna provides crucial insights into dinosaur evolutionary transitions.