首页|A self-locking mechanism of the frog-legged beetle Sagra femorata

A self-locking mechanism of the frog-legged beetle Sagra femorata

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Insect legs play a crucial role in various modes of locomotion,including walking,jumping,swimming,and other forms of movement.The flexibility of their leg joints is critical in enabling various modes of locomotion.The frog-legged leaf beetle Sagra femorata possesses remarkably enlarged hind legs,which are considered to be a critical adaptation that enables the species to withstand external pressures.When con-fronted with external threats,S.femorata initiates a stress response by rapidly rotating its hind legs backward and upward to a specific angle,thereby potentially intimidat-ing potential assailants.Based on video analysis,we identified 4 distinct phases of the hind leg rotation process in S.femorata,which were determined by the range of rotation angles(0°-168.77°).Utilizing micro-computed tomography(micro-CT)technology,we performed a 3-dimensional(3D)reconstruction and conducted relative positioning and volumetric analysis of the metacoxa and metatrochanter of S.femorata.Our analysis re-vealed that the metacoxa-trochanter joint is a"screw-nut"structure connected by 4 mus-cles,which regulate the rotation of the legs.Further testing using a 3D-printed model of the metacoxa-trochanter joint demonstrated its possession of a self-locking mechanism capable of securing the legs in specific positions to prevent excessive rotation and disloca-tion.It can be envisioned that this self-locking mechanism holds potential for application in bio-inspired robotics.

coxaleg jointsmicro-CTSagra femorataself-lockingtrochanter

Le Zong、Zonghui Sun、Jieliang Zhao、Zhengzhong Huang、Xiaokun Liu、Lei Jiang、Congqiao Li、Jacob Mulwa Muinde、Jianing Wu、Xiaolong Wang、Hongbin Liang、Haoyu Liu、Yuxia Yang、Siqin Ge

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Key Laboratory of Zoological Systematics and Evolution,Institute of ZoologyChinese Academy of Sciences,Beijing,China

University of Chinese Academy of Sciences,Beijing,China

The Key Laboratory of Zoological Systematics and Application,School of Life Science,Institute of Life Science and Green Development,Hebei University,Baoding,Hebei Province,China

Department of Mechanical Engi-neering,Beijing Institute of Technology,Beijing,China

School of Aeronautics and Astronautics,Sun Yat-sen University,Shenzhen,Guangdong Province,China

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2024

10.1111/1744-7917.13323

中国昆虫科学(英文版)
中国昆虫学会 中科院动物所

中国昆虫科学(英文版)

CSTPCD
影响因子：0.484
ISSN：1672-9609
年,卷(期)：2024.31(6)