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Variable segment number in centipedes: population genetics meets evolutionary developmental biology
1Ecology Centre, University of Sunderland, Sunderland SR1 3SD, UK. wallace.arthur@sunderland.ac.uk
Evolution & Development
|April 28, 2001
Summary
Geophilomorph centipedes offer a novel model for studying evolutionary developmental biology. Their variable segment number provides insights into intraspecific variation and selective pressures in development.
Area of Science:
- Evolutionary developmental biology
- Population genetics
- Animal morphology
Background:
- Population genetics typically studies intraspecific variation in non-structural traits.
- Evolutionary developmental biology focuses on structure/ontogeny, often using interspecific comparisons.
- A model system for intraspecific variation in development is needed.
Purpose of the Study:
- To propose geophilomorph centipede segment number as a model system.
- To investigate intraspecific variation in segment number within geophilomorphs.
- To explore the genetic basis and selective importance of segment number variation.
Main Methods:
- Analyzing existing data on segment number variation in geophilomorph species.
- Comparing segment number variability across different centipede orders (geophilomorphs, scutigeromorphs, lithobiomorphs, scolopendromorphs).
- Statistical analysis to assess the significance of segment number variation.
Main Results:
- Segment number is polymorphic in geophilomorph centipedes, unlike other orders where it is fixed.
- Statistical analysis suggests segment number variation may be under selective pressure.
- This variation is unlikely to be solely a consequence of developmental limitations.
Conclusions:
- Geophilomorph centipede segment number is a viable model for studying intraspecific variation in development.
- The observed variation indicates potential selective importance of segment number.
- This system can bridge population genetics and evolutionary developmental biology.