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Int. J. Mol. Sci. 2014, 15(4), 6009-6018;

The Hydraulic Mechanism of the Unfolding of Hind Wings in Dorcus titanus platymelus (Order: Coleoptera)

Key Laboratory of Bionic Engineering (Ministry of Education), Jilin University, Changchun 130025, China
Nanoprobe Laboratory for Bio- & Nanotechnology and Biomimetics (NLB2), the Ohio State University, 201 W. 19th Avenue, Columbus, OH 43210-1142, USA
Authors to whom correspondence should be addressed.
Received: 25 February 2014 / Revised: 21 March 2014 / Accepted: 31 March 2014 / Published: 9 April 2014
(This article belongs to the Special Issue Biomimetic and Functional Materials)
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In most beetles, the hind wings are thin and fragile; when at rest, they are held over the back of the beetle. When the hind wing unfolds, it provides the necessary aerodynamic forces for flight. In this paper, we investigate the hydraulic mechanism of the unfolding process of the hind wings in Dorcus titanus platymelus (Oder: Coleoptera). The wing unfolding process of Dorcus titanus platymelus was examined using high speed camera sequences (400 frames/s), and the hydraulic pressure in the veins was measured with a biological pressure sensor and dynamic signal acquisition and analysis (DSA) during the expansion process. We found that the total time for the release of hydraulic pressure during wing folding is longer than the time required for unfolding. The pressure is proportional to the length of the wings and the body mass of the beetle. A retinal camera was used to investigate the fluid direction. We found that the peak pressures correspond to two main cross-folding joint expansions in the hind wing. These observations strongly suggest that blood pressure facilitates the extension of hind wings during unfolding. View Full-Text
Keywords: beetle; hind wing; unfolding; hydraulic mechanism; micro air vehicles (MAVs) beetle; hind wing; unfolding; hydraulic mechanism; micro air vehicles (MAVs)

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This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Sun, J.; Ling, M.; Wu, W.; Bhushan, B.; Tong, J. The Hydraulic Mechanism of the Unfolding of Hind Wings in Dorcus titanus platymelus (Order: Coleoptera). Int. J. Mol. Sci. 2014, 15, 6009-6018.

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