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Hydrobiologia

, Volume 630, Issue 1, pp 219–229 | Cite as

Semiaquatic Heteroptera locomotion: coral treaders (Hermatobates weddi, Hermatobatidae), sea skaters (Halovelia septentrionalis, Veliidae), and water striders (Metrocoris histrio, Gerridae). Usual and unusual gaits

  • Pablo Perez GoodwynEmail author
  • Yasunori Maezono
  • Hiroki Takamatsu
  • Kenji Fujisaki
Primary research paper

Abstract

Using high-speed video recordings, we carried out an analysis of the locomotion gaits of the following aquatic Heteroptera: coral treaders Hermatobates weddi (Hermatobatidae), sea striders Halovelia septentrionalis (Veliidae), and water striders Metrocoris histrio (Gerridae), in the Island of Amami Oshima, Kagoshima Prefecture, Japan. Most insects use an alternating double tripod gait for walking, whereas species of Gerridae and some Veliidae use a synchronous rowing gait. We found that H. weddi used a peculiar locomotion gait, a modification of the double tripod gait. In this special gait, two alternating dipods (mid and hind legs) are used, while the forelegs remained inactive. Contralateral mid and hind stroked simultaneously. The mid leg recovered immediately after the stroke; however, the hind leg was delayed and remained extended after the stroke. Next, the following bipod stroked, and when that mid leg finished the stroke, both ipsilateral mid and hind (the one which did not recover after the stroke) legs recovered together. Turning is also unique in H. weddi because the body axis rotation and the course turning (deflection) were clearly separated in two phases. We compared the kinematics of H. weddi pattern with the synchronous rowing pattern found in H. septentrionalis and M. histrio and discussed some biomechanical consequences. We also analyzed phylogenetic implications of this gait, and we posit that the modified double dipod gait is a uniquely derived character of the family Hermatobatidae. The synchronous rowing gait would be an autapomorphy for the clade Gerridae + Veliidae. The modified thorax, with the meso and metacoxae horizontally directed, would be a synapomorphy for the superfamily Gerroidea (Hermatobatidae, Gerridae, and Veliidae).

Keywords

Biomechanics Water-walking insects Marine insect Surface tension 

Notes

Acknowledgments

We would like to thank Mr. Ichizou Tokushima for his invaluable help during the field work in Amami Island. We would like to thank Dagmar Voigt, Dmitry Musolin, and three anonymous referees for their valuable comments on an early manuscript. This research was supported by the COE twenty-first Century Program Project ‘‘Innovative Food and Environmental Studies Pioneered by Entomomimetic Sciences’’.

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Copyright information

© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  • Pablo Perez Goodwyn
    • 1
    Email author
  • Yasunori Maezono
    • 1
  • Hiroki Takamatsu
    • 1
  • Kenji Fujisaki
    • 1
  1. 1.Division of Applied Biosciences, Laboratory of Insect Ecology, Graduate School of AgricultureKyoto UniversityKyotoJapan

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