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Related Experiment Videos

Conserved developmental processes constrain evolution of lungfish dentitions.

M M Smith1, N I Krupina

  • 1Craniofacial Development, Dental Institute, King's College, London, UK. moya.smith@kcl.ac.uk

Journal of Anatomy
|August 29, 2001
PubMed
Summary
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Lungfish (Dipnoi) exhibit a conserved tooth development pattern from ancient to modern species. This unique radial tooth initiation and consolidation, unlike other fish, likely constrained their evolutionary dental development.

Area of Science:

  • Paleontology
  • Developmental Biology
  • Evolutionary Biology

Background:

  • Living lungfish genera display diverse adult tooth plate shapes.
  • Larval lungfish, however, share similar developmental patterns in tooth formation.
  • Fossil lungfish dentitions offer insights into conserved evolutionary processes.

Purpose of the Study:

  • To establish a developmental model for fossil lungfish tooth plates using Neoceratodus hatchlings.
  • To investigate conserved developmental processes in lungfish dentition from the Late Devonian to extant species.
  • To contrast the unique lungfish tooth development pattern with typical osteichthyan and chondrichthyan dentitions.

Main Methods:

  • Comparative analysis of larval and fossil lungfish tooth plate development.

Related Experiment Videos

  • Ontogenetic study of tooth initiation and modification in Neoceratodus hatchlings.
  • Examination of 3-dimensional fossil dentitions from Andreyevichthys and Diabolepis speratus.

    • Main Results:

    • Neoceratodus hatchling tooth development provides a model for fossil lungfish like Andreyevichthys.
    • A unique radial pattern of tooth initiation and consolidation, without shedding, is characteristic of lungfish.
    • This pattern is present in early dipnoans (Diabolepis speratus) and conserved through evolution.
    • Fossil and extant hatchlings show teeth on marginal bones, based on a radial pattern.

    Conclusions:

    • A specific, conserved developmental pattern for dentition evolved early in lungfish (Dipnoi).
    • This ontogenetic pattern likely constrained the phylogenetic evolution of adult lungfish dentition over 360 million years.
    • The universality of this developmental module highlights significant evolutionary constraints in dipnoan dental development.