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Developmental patterns and variation among early theropods.

C T Griffin1

  • 1Department of Geosciences, Virginia Tech, Blacksburg, VA, USA.

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|January 25, 2018
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Summary
This summary is machine-generated.

Studying dinosaur growth (ontogeny) reveals variation in early theropods like Coelophysis bauri. This research uses ontogenetic sequence analysis to understand developmental patterns and their impact on paleontology.

Keywords:
JurassicTriassicbone scardinosaurintraspecific variationmorphological maturityontogenytheropod

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Area of Science:

  • Paleontology
  • Developmental Biology
  • Evolutionary Biology

Background:

  • Understanding ontogenetic patterns is crucial for vertebrate paleontology, impacting paleobiogeography, species synonymy, paleobiology, and body size evolution.
  • Histological sampling is often destructive and the ontogeny of early dinosaurs is poorly understood due to small, incomplete growth series.
  • Early theropods Coelophysis bauri and Megapnosaurus rhodesiensis offer opportunities to study ontogeny due to large sample sizes.

Purpose of the Study:

  • To investigate morphological changes during ontogeny in early theropods.
  • To reconstruct developmental sequences using ontogenetic sequence analysis (OSA).
  • To assess the implications of ontogenetic variation for phylogenetic analyses.

Main Methods:

  • Employed ontogenetic sequence analysis (OSA) on postcranial elements.
  • Analyzed large sample sizes (n=174 for C. bauri, n=182 for M. rhodesiensis).
  • Examined morphological changes throughout the ontogeny of selected early theropods.

Main Results:

  • Identified significant sequence polymorphism (variation in developmental patterns) in both C. bauri and M. rhodesiensis.
  • C. bauri exhibited variation in every analyzed element, while M. rhodesiensis showed no variation in tibia and tarsus development sequences.
  • Discovered a phylogenetic signal in the order of homologous character appearance during ontogeny, relevant to early theropods and silesaurids.

Conclusions:

  • Ontogenetic variation in early theropods is substantial, influencing the interpretation of morphological characters.
  • Consistent timing of some developmental characters can aid in assessing relative maturity of early theropods.
  • Morphological features used in archosaurian phylogeny (e.g., trochanteric shelf) can be ontogenetically dependent, requiring cautious use in phylogenetic analyses.