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Two-step Approach to Explore Early- and Late-stages of Organ Formation in the Avian Model: The Thymus and Parathyroid Glands Organogenesis Paradigm
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The theropod furcula.

Sterling J Nesbitt1, Alan H Turner, Michelle Spaulding

  • 1Division of Paleontology, American Museum of Natural History, New York, New York 10024, USA. nesbitt@ldeo.columbia.edu

Journal of Morphology
|February 12, 2009
PubMed
Summary
This summary is machine-generated.

The furcula, a fused clavicle unique to theropods, appeared early in their history. Its morphology, though variable in birds, is conserved in non-avian theropods, offering phylogenetic insights.

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Area of Science:

  • Paleontology
  • Evolutionary Biology
  • Comparative Anatomy

Background:

  • The furcula, formed by fused clavicles, is a key skeletal element in theropod dinosaurs.
  • It is considered crucial for understanding the evolutionary link between non-avian theropods and modern birds.

Purpose of the Study:

  • To review the development, function, and morphology of the furcula across Theropoda.
  • To describe furcular morphology in various non-avian theropods and analyze its phylogenetic significance.

Main Methods:

  • Examination of new theropod specimens from the Early Cretaceous of China.
  • Detailed analysis of previously collected theropod specimens.
  • Review of existing literature on furcular anatomy and terminology.

Main Results:

  • The furcula is present in nearly all major theropod clades, indicating its early origin.
  • Furcular morphology is highly conserved among non-avian theropods but variable in avian dinosaurs.
  • New specimens provide insights into early furcula evolution and phylogenetic character distribution.

Conclusions:

  • The furcula likely originated very early in theropod evolution.
  • Furcular morphology provides valuable phylogenetic characters for understanding theropod relationships.
  • Careful consideration of taphonomic effects is necessary when analyzing furcular morphology.