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Related Experiment Videos

Developmental constraints conserve evolutionary pattern in an osteichthyan dentition.

Moya Meredith Smith1, Natasha I Krupina, Jean Joss

  • 1Dental Institute KCL, Guy's Tower, London, SE1 9RT, United Kingdom. moya.smith@kcl.ac.uk

Connective Tissue Research
|December 20, 2002
PubMed
Summary
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Lungfish possess a unique toothplate dentition unlike other bony fish. This study reveals a conserved developmental pattern for marginal teeth, present from early fossil forms to modern species.

Area of Science:

  • Paleontology
  • Developmental Biology
  • Ichthyology

Background:

  • Lungfish (Dipnoi) exhibit a unique toothplate dentition, differing from the marginal tooth rows found in most osteichthyan fish.
  • The growth and tooth addition patterns in lungfish are governed by a specific initiation pattern, with new teeth added laterally in adult forms.
  • This contrasts with the regular, alternating replacement seen in the marginal tooth rows of most other bony fish.

Purpose of the Study:

  • To analyze the developmental patterns of lungfish dentition.
  • To compare the developmental patterns between fossil and extant lungfish species.
  • To investigate the evolutionary conservation of tooth development in lungfish.

Main Methods:

  • Analysis of fossil hatchling forms of the Late Devonian dipnoan Andreyevichthys.

Related Experiment Videos

  • Comparative analysis with the dentition of Neoceratodus, the Australian lungfish.
  • Examination of tooth initiation, addition, and retention patterns during development.

    • Main Results:

    • A unique developmental pattern was identified in lungfish dentition, characterized by toothplates.
    • New teeth in adult lungfish are added only laterally to radial rows, unlike the marginal replacement in other osteichthyans.
    • A transitory, marginal, anterior dentition was observed in both fossil and extant lungfish, indicating a conserved developmental program.

    Conclusions:

    • The developmental pattern of lungfish dentition, including the unique toothplate arrangement and marginal tooth development, is highly conserved.
    • This conserved developmental program has persisted for at least 360 million years, from the earliest known lungfish forms.
    • The study highlights the evolutionary stability of developmental pathways in lungfish dentition.