A study of ladder-like silk foothold for the locomotion of bagworms

Abstract While walking on horizontal substrates, caterpillars skilfully engage all their legs, including three pairs of thoracic legs and a maximum of five pairs of prolegs, to move in a flexible wave-like motion. Such locomotory behaviours, represented by ‘crawling’ and ‘inching’ motions, have wide...

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Autores principales:	Taiyo Yoshioka, Fumiko Yukuhiro, Tsunenori Kameda
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/496430becc0d43b4a3f027552e87c304
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spelling	oai:doaj.org-article:496430becc0d43b4a3f027552e87c3042021-12-02T15:10:50ZA study of ladder-like silk foothold for the locomotion of bagworms10.1038/s41598-021-95809-72045-2322https://doaj.org/article/496430becc0d43b4a3f027552e87c3042021-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-95809-7https://doaj.org/toc/2045-2322Abstract While walking on horizontal substrates, caterpillars skilfully engage all their legs, including three pairs of thoracic legs and a maximum of five pairs of prolegs, to move in a flexible wave-like motion. Such locomotory behaviours, represented by ‘crawling’ and ‘inching’ motions, have widely inspired the development of locomotion systems in soft robotics. However, bagworms are unable to use their prolegs for walking because these are always accommodated in a portable bag; thus, they are unable to walk using such general locomotory behaviours. Indeed, how they walk with only three pairs of thoracic legs is unknown at present. In this study, we show that bagworms construct a ladder-like foothold using their silk to walk without using prolegs. This enables them to walk not only on horizontal floor surfaces but also on wall and ceiling surfaces, even those with slippery or smooth surfaces. They construct the foothold by spinning a continuous silk thread in a zigzag manner and controlling the discharge of adhesive to attach the folded parts of the silk to a substrate. Discovery of this elaborate silk utilisation technique offers fresh insights into the diversity of silk use in lepidopteran larvae and provides potential designs for robot locomotion systems.Taiyo YoshiokaFumiko YukuhiroTsunenori KamedaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Taiyo Yoshioka Fumiko Yukuhiro Tsunenori Kameda A study of ladder-like silk foothold for the locomotion of bagworms
description	Abstract While walking on horizontal substrates, caterpillars skilfully engage all their legs, including three pairs of thoracic legs and a maximum of five pairs of prolegs, to move in a flexible wave-like motion. Such locomotory behaviours, represented by ‘crawling’ and ‘inching’ motions, have widely inspired the development of locomotion systems in soft robotics. However, bagworms are unable to use their prolegs for walking because these are always accommodated in a portable bag; thus, they are unable to walk using such general locomotory behaviours. Indeed, how they walk with only three pairs of thoracic legs is unknown at present. In this study, we show that bagworms construct a ladder-like foothold using their silk to walk without using prolegs. This enables them to walk not only on horizontal floor surfaces but also on wall and ceiling surfaces, even those with slippery or smooth surfaces. They construct the foothold by spinning a continuous silk thread in a zigzag manner and controlling the discharge of adhesive to attach the folded parts of the silk to a substrate. Discovery of this elaborate silk utilisation technique offers fresh insights into the diversity of silk use in lepidopteran larvae and provides potential designs for robot locomotion systems.
format	article
author	Taiyo Yoshioka Fumiko Yukuhiro Tsunenori Kameda
author_facet	Taiyo Yoshioka Fumiko Yukuhiro Tsunenori Kameda
author_sort	Taiyo Yoshioka
title	A study of ladder-like silk foothold for the locomotion of bagworms
title_short	A study of ladder-like silk foothold for the locomotion of bagworms
title_full	A study of ladder-like silk foothold for the locomotion of bagworms
title_fullStr	A study of ladder-like silk foothold for the locomotion of bagworms
title_full_unstemmed	A study of ladder-like silk foothold for the locomotion of bagworms
title_sort	study of ladder-like silk foothold for the locomotion of bagworms
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/496430becc0d43b4a3f027552e87c304
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A study of ladder-like silk foothold for the locomotion of bagworms

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