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首页> 外文期刊>Marine biology >Bilateral symmetry and locomotion: do elliptical regular sea urchins proceed along their longer body axis?
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Bilateral symmetry and locomotion: do elliptical regular sea urchins proceed along their longer body axis?

机译：双边对称性和运动性：椭圆形的普通海胆是否沿着其较长的体轴延伸？

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摘要

Vagile animals usually have bilaterally symmetrical bodies and proceed with their mouth-end first. Regular sea urchins have, however, radially symmetrical bodies with their mouth facing the substratum and show no preference in which side of the body should be anterior in their locomotion. The elliptical sea urchins in the subfamily Echinometrinae are exceptional among regular sea urchins in having elongated bilateral bodies. We studied whether they showed the preference in the direction of locomotion using Echinometra sp. type A. Directional preference was not observed in the proceedings in an open space. However, they proceeded preferentially with their long axis coinciding with the direction of locomotion when they moved along the water surface or along the wall of the aquarium. The speed of locomotion was the same irrespective of the direction of proceedings and of whether sea urchins moved freely or moved along the water surface or along the walls. We suggest that the bilateral body form and the habit of long-axis lead of this sea urchin have adaptive significance to increase the protected body surfaces, not to facilitate the efficiency in locomotion.
机译：易变的动物通常具有左右对称的身体，并先从嘴端开始。但是，普通海胆的嘴巴朝向基底，具有放射状的对称体，在运动的哪一侧应在前侧没有偏向。棘皮纲亚科中的椭圆形海胆在常规海胆中具有双侧体长的特殊之处。我们研究了他们是否使用Echinometra sp在运动方向上显示出偏好。类型A。在开放空间中的程序中未观察到方向性偏爱。然而，当它们沿着水面或沿着水族箱壁移动时，它们的长轴优先与运动方向一致。无论诉讼的方向如何，海胆是否自由移动，还是沿着水面还是沿着墙壁移动，移动的速度都是相同的。我们建议这种海胆的双侧身体形态和长轴铅的习性具有适应性意义，以增加受保护的身体表面，而不是促进运动效率。

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  • 来源
    《Marine biology》 |2008年第5期|p.911-918|共8页
  • 作者

    Kazuya Yoshimura; Tatsuo Motokawa;

  • 作者单位

    Department of Biological Sciences, Graduate School of Bioscience & Biotechnology, Tokyo Institute of Technology, W3-42, O-okayama 2-12-1 Meguro, Tokyo 152-8551, Japan;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境生物学;
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