尾索

海鞘（Ascidian）属于脊索动物门（Chordates），尾索动物亚门（Urochordata），海鞘纲（Ascidiacea），全世界约有2000种，广泛分布于各海域中。

Styela plicata is an ascidian which belongs to class Ascidiacea , subphylum urochordata , phylum Chordates . About 2000 kinds of ascidians have been found in the nature and they distribute over the maritime space .

本文的研究结果为尾索动物生殖内分泌功能的研究提供了新的证据。另一种观点认为，文昌鱼不是与脊椎动物祖先生物最接近的动物，尾索动物即被囊动物更接近于脊椎动物的祖先。

Furthermore , these results offer new evidences to the studies on the endocrine regulation of Urochordata .

红树林生态系中的成员从藻类、高等植物及海绵、刺胞、环节、软体、节肢、尾索等无脊椎动物，到鸟类和鱼类等脊椎动物。

Mangrove ecosystems include algae and flowering plants , invertebrates such as sponges , worms , shellfish , and shellfish , and crabs , and vertebrates like birds , reptiles , mammals and fishes .

并且无法仅仅利用尾索与辅助墩处的拉索变化来减小压重。

You can not only use the cable of pier which is at the end and ancillary changes to reduce the pressure of the cable weight . By calculating the influences of the live load , we come to a conclusion of the internal force state of the cable-stayed bridge .