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Adhesive latching and legless leaping in small, worm-like insect larvae.

G M Farley1, M J Wise2, J S Harrison1

  • 1Biology Department, Duke University, Durham, NC 27708, USA.

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|August 10, 2019
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Summary

Legless gall midge larvae achieve long-distance jumps by storing elastic energy and using a novel adhesive latch. This efficient leaping mechanism rivals legged jumpers and offers insights for soft robotics.

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AdhesionElasticHydrostaticLatchLocomotionPower amplification

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Area of Science:

  • Biomechanics and evolutionary biology
  • Insect locomotion and morphology
  • Soft robotics and adhesion science

Background:

  • Legs are typically used for jumping, but legless leaping has evolved independently multiple times.
  • Gall midge larvae (Asphondylia sp.) are legless invertebrates capable of remarkable leaps.

Purpose of the Study:

  • To investigate the kinematics, energetics, and morphology of long-distance jumps in legless gall midge larvae.
  • To elucidate the mechanism of elastic energy storage and release during larval leaping.
  • To compare the energetic efficiency of larval jumping versus crawling.

Main Methods:

  • Analysis of jump kinematics, including takeoff speed and horizontal distance.
  • Measurement of mass-specific power density to infer energy storage mechanisms.
  • Morphological examination of body structures involved in energy storage and adhesion.
  • Comparison of jump energetics with theoretical crawling energetics.

Main Results:

  • Larvae store elastic energy by forming a body loop and creating a transient 'leg'.
  • A novel adhesive latch, using microstructures, prevents movement during energy loading.
  • Jumps achieved average takeoff speeds of 0.85 m/s and distances up to 36 times body length.
  • Mass-specific power density indicates elastic energy utilization, rivaling legged jumpers.
  • The adhesive latch is sufficient to withstand pre-jump loading forces.
  • Jumping is orders of magnitude more energetically efficient than crawling equivalent distances.

Conclusions:

  • Legless gall midge larvae employ a unique, efficient leaping strategy involving elastic energy storage and an adhesive latch.
  • This mechanism provides significant energetic advantages over crawling for long-distance travel.
  • The findings integrate principles of soft robotics, high-acceleration systems, and adhesion, highlighting a new area of biological diversity.