Table of Contents
International Journal of Oceanography
Volume 2014, Article ID 845407, 3 pages
http://dx.doi.org/10.1155/2014/845407
Research Article

Walking Behavior Observed in Phoxichilidium femoratum (Rathke, 1799) and Nymphon brevirostre Hodge 1863 Collected from Kandalaksha Bay of the White Sea, Russia

1National Museum of Natural History, Department of Invertebrate Zoology, Smithsonian Institution, Washington, DC, USA
2Nikolai Pertsov White Sea biological Station, Lomonosov Moscow State University, Russia

Received 16 August 2014; Revised 13 October 2014; Accepted 3 November 2014; Published 18 November 2014

Academic Editor: Heinrich Hühnerfuss

Copyright © 2014 John A. Fornshell. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

In this study, the walking behavior of Phoxichilidium femoratum and Nymphon brevirostre was investigated using video recordings. The walking behavior of P. femoratum while walking over the colonial hydroids that they normally feed on and on relatively smooth glass surfaces was observed. In the case of N. brevirostre, only walking on smooth glass was observed. The movement of the legs while waking does not display a metachronal pattern like that observed in the true spiders. As the animals move, the walking legs on the leading side of the animal are used to pull the animal forward while those on the trailing side make little or no contribution to the motion of the animal. The promoter/remoter motions of the coxa 1-coxa 2 joint of the walking legs are involved in azimuthal changes in the body’s orientation, but not in paraxial locomotion. The extension of the tarsus and propodus segments appears to occur as a result of hydrodynamic drag when the legs are being flexed and/or pressed against a solid substrate.