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Updated: May 7, 2026
10:19
Studying the Neural Basis of Adaptive Locomotor Behavior in Insects
Published on: April 13, 2011
Interacting gears synchronize propulsive leg movements in a jumping insect.
Malcolm Burrows1, Gregory Sutton
1Department of Zoology, University of Cambridge, Cambridge, UK. mb135@hermes.cam.ac.uk
Science (New York, N.Y.)
|September 14, 2013
Summary
Insects possess rare biological gears! Planthopper nymphs use hindleg cog teeth for synchronized ballistic jumping, a mechanism lost in adulthood.
Area of Science:
- Zoology
- Biomechanics
- Evolutionary Biology
Background:
- Gears are uncommon in nature and have not been observed to function mechanically.
- Animal locomotion often involves complex biomechanical systems.
Purpose of the Study:
- To investigate the presence and function of gears in animal locomotion.
- To describe the unique jumping mechanism in the planthopper insect Issus.
Main Methods:
- Microscopic examination of planthopper nymphs (Issus).
- Analysis of hindleg morphology and high-speed video of jumping behavior.
- Comparative study between nymph and adult stages.
Main Results:
- Planthopper nymphs possess interlocking cuticular gear teeth on their hindlegs.
- These gears synchronize hindleg movement during ballistic jumps, preventing rotation.
- The gear mechanism is present only in nymphs and lost during the final molt to adulthood.
Conclusions:
- Functional gears exist in the animal kingdom, specifically in Issus planthopper nymphs.
- This biological gear system is crucial for efficient and controlled ballistic jumping.
- The loss of gears in adulthood suggests a developmental or ecological adaptation.
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