| 单词 | 脊索 |
| 释义 | 〔hemichordate〕Any of various wormlike marine animals of the phylum Hemichordata, having a primitive notochord and gill slits.半索动物：半索动物门中类似蠕虫的海生动物的任何一种，具有原始的脊索和鳃腔外口〔urochord〕A notochord limited to the caudal region, characteristic of the urochordates.尾索：限于尾部的脊索，有尾索动物的特征〔mesomere〕The middle zone of the mesoderm of a chordate vertebrate embryo, from which excretory tissue develops.中胚叶节：脊索类脊椎动物胚胎的中胚层的中间部分，最终会发育成排泄组织〔tunicate〕Any of various chordate marine animals of the subphylum Tunicata or Urochordata having a cylindrical or globular body enclosed in a tough outer covering and including the sea squirts and salps.被囊动物：属于尾索亚门或囊亚门的各种脊索类海生动物中的一种，身体呈圆形或球形，包在坚硬的壳中，这动物包括海鞘和萨尔帕属的背囊动物〔lancelet〕Any of various small, flattened marine organisms of the subphylum Cephalochordata, structurally similar to the vertebrates but having a notochord rather than a true vertebral column. Also called amphioxus 蛞蝓鱼类：任一种体形较小的头索动物纲的扁平海洋动物，它们在结构上与脊椎动物类似，但只有一个脊索而没有真正的脊椎 也作 amphioxus〔somite〕A segmental mass of mesoderm in the vertebrate embryo, occurring in pairs along the notochord and developing into muscles and vertebrae.体节：脊椎动物胚胎中胚层中的体节物质，沿脊索成对出现，后生长成肌肉或脊椎〔notochord〕A flexible rodlike structure that forms the main support of the body in the lowest chordates, such as the lancelet; a primitive backbone.脊索：细胞构成的一条纵长可弯曲的杆状结构，其作用是引导产生神经板，形成躯体的支持轴〔notochord〕A similar structure in embryos of higher vertebrates, from which the spinal column develops.脊索：更为高等的脊椎动物胚胎中的类似结构，脊椎骨由此发育 |
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