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Vertebral development and amphibian evolution.

R L Carroll1, A Kuntz, K Albright

  • 1Redpath Museum, McGill University, 859 Sherbrooke St. West, Montreal H3A 2K6, Canada. RobertC@Shared1.Lan.McGill.Ca

Evolution & Development
|April 28, 2001
PubMed
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Investigating amphibian vertebral development reveals distinct patterns in frogs versus salamanders and caecilians. These differences, seen in fossil records, suggest early tetrapod evolutionary divergence and may stem from molecular variations in cell development.

Area of Science:

  • Paleontology and Evolutionary Biology
  • Developmental Biology
  • Vertebrate Morphology

Background:

  • Amphibian larval stages offer insights into vertebrate evolution and development.
  • Vertebral ossification patterns vary significantly among modern amphibians (frogs, salamanders, caecilians).
  • Fossil records of Paleozoic amphibians provide comparative data for evolutionary studies.

Purpose of the Study:

  • To compare vertebral development patterns in modern amphibians with fossil taxa.
  • To infer the phylogenetic significance of distinct vertebral ossification rates.
  • To explore potential molecular mechanisms underlying developmental divergence.

Main Methods:

  • Comparative analysis of vertebral ossification timing in modern frog, salamander, and caecilian development.

Related Experiment Videos

  • Comparison of these patterns with known vertebral development in Paleozoic labyrinthodonts and lepospondyls.
  • Consideration of molecular data (e.g., Pax1 gene expression) from model organisms.

    • Main Results:

    • Frogs exhibit delayed ossification of vertebral centra, resembling labyrinthodonts, facilitating tail loss during metamorphosis.
    • Salamanders and caecilians show earlier ossification of vertebral centra, similar to lepospondyls.
    • These distinct developmental patterns suggest an early phylogenetic split among tetrapod ancestors, potentially in the Lower Carboniferous.

    Conclusions:

    • Divergent vertebral development patterns in amphibians reflect deep evolutionary history and phylogenetic separation.
    • The timing of vertebral ossification may be linked to the migration of sclerotomal cells and gene expression (e.g., Pax1).
    • Amphibian fossils are crucial for understanding the evolution of vertebrate skeletal development.