Using Pose Estimation and 3D Rendered Models to Study Leg-Mediated Self-righting by Lanternflies.

Area of Science:

• Biomechanics
• Robotics
• Insect locomotion

Background:

• Terrestrial self-righting is vital for organisms and robots to recover from overturning.
• Existing models explain self-righting based on morphology but lack detailed limb motion analysis.
• Spotted lanternfly nymphs frequently need to self-right after jumping and falling.

Purpose of the Study:

• To quantify and model all limb motions during terrestrial self-righting in spotted lanternfly nymphs.
• To understand the mechanical principles underlying their efficient upright recovery.
• To develop low-cost modeling methods applicable to other biomechanics problems.

Main Methods:

• High-speed video tracking of 3D poses combined with articulated 3D models (photogrammetry, Blender).
• Calculation of mechanical properties (energy, torque, force) during righting.
• Development and application of physical models (pendulum and anchor models) to analyze motion dynamics.

Main Results:

• Spotted lanternfly nymphs achieved high success rates (92-100%) in self-righting across varied substrates.
• They employed three stereotypic movement sequences, with diagonal rotation being the most effective.
• The anchor model successfully captured coordinated leg movements for propulsion, adhesion, and inertial reorientation.

Conclusions:

• Coordinated leg movements and body rotation are key to efficient terrestrial self-righting in these insects.
• The study provides a detailed biomechanical model of insect self-righting.
• The developed low-cost modeling approach can be applied to diverse biomechanical challenges.