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Related Experiment Video

Updated: May 31, 2026

Insect-machine Hybrid System: Remote Radio Control of a Freely Flying Beetle (Mercynorrhina torquata)

Insect-machine Hybrid System: Remote Radio Control of a Freely Flying Beetle (Mercynorrhina torquata)

Published on: September 2, 2016

A biological screw in a beetle's leg.

Thomas van de Kamp¹, Patrik Vagovič, Tilo Baumbach

¹ANKA-Institute for Synchrotron Radiation, Karlsruhe Institute of Technology, D-76344 Eggenstein-Leopoldshafen, Germany.

Science (New York, N.Y.)

|July 2, 2011

Summary

The weevil Trigonopterus oblongus utilizes a unique biological screw-and-nut mechanism in its leg joints. This discovery reveals intricate natural engineering within insect anatomy.

Area of Science:

Entomology
Biomechanics
Comparative Morphology

Background:

Insect leg joints are crucial for locomotion and stability.
The coxa-trochanteral joint's function in weevils remains incompletely understood.
Previous studies have not identified screw-and-nut mechanisms in insect leg joints.

Purpose of the Study:

To investigate the functional morphology of the coxa-trochanteral joint in Trigonopterus oblongus.
To determine if the joint operates via a novel biological screw-and-nut system.
To provide detailed structural analysis of the joint components.

Main Methods:

Microscopic examination of the coxa-trochanteral joint in Trigonopterus oblongus.
Detailed morphological analysis of the apical coxae and trochanters.

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Comparative analysis with known screw and nut structures.

Main Results:

The coxa-trochanteral joint of Trigonopterus oblongus functions as a biological screw-and-nut system.
Coxal apical portions exhibit nut-like structures with 345° inner threads.
Trochanters display compatible external spiral threads covering 410°.

Conclusions:

The unique screw-and-nut articulation in Trigonopterus oblongus leg joints represents a novel biomechanical adaptation.
This finding enhances our understanding of insect joint complexity and evolutionary innovation.
The specialized joint likely confers advantages in stability and movement for the weevil.