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Updated: Mar 21, 2026
08:02
Dissection and Flat-mounting of the Threespine Stickleback Branchial Skeleton
Published on: May 7, 2016
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Early development and replacement of the stickleback dentition
Nicholas A Ellis1, Nikunj N Donde1, Craig T Miller1
1Department of Molecular and Cell Biology, University of California-Berkeley, Berkeley, California.
Journal of Morphology
|May 5, 2016
Summary
Threespine stickleback fish reveal conserved patterns in early tooth development and replacement. Their dental morphology provides insights into the evolution of tooth regeneration across fish lineages.
Area of Science:
- Developmental Biology
- Evolutionary Biology
- Comparative Anatomy
Background:
- Teeth are crucial models for studying vertebrate organogenesis, morphogenesis, and evolution.
- Nonmammalian vertebrates, particularly fish, exhibit diverse dental patterning and lifelong tooth regeneration.
- Threespine stickleback fish (Gasterosteus aculeatus) offer a powerful model for investigating dental morphology evolution and development.
Purpose of the Study:
- To describe the oral and pharyngeal dentitions of threespine stickleback fish.
- To provide evidence for the homology of oral and pharyngeal teeth.
- To detail the early tooth formation sequence in stickleback ventral pharyngeal dentition.
Main Methods:
- Morphological and histological analysis of stickleback dentition.
- Molecular evidence to support tooth homology.
- Developmental time course analysis of lab-reared fish.
Main Results:
- Detailed description of stickleback oral and pharyngeal dentitions.
- Confirmation of homology between oral and pharyngeal teeth.
- Identification of a stereotypical early tooth formation sequence involving seventeen primary teeth and the first replacement event in ventral pharyngeal dentition.
Conclusions:
- The threespine stickleback provides a valuable model for studying dental development and evolution.
- The observed tooth formation sequence is highly conserved early in development.
- Comparative analysis reveals significant evolutionary changes in dental morphology and regeneration strategies across fish lineages.
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