There are about 45.000 species of chordates, occupying marine, fresh and brackish water and terrestrial habitats.

有大约45.000种脊索动物,它们占据着海 、 淡水或淡咸水和陆地的生态环境.

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Chordates are bilaterally symmetrical, triploblastic segmented coelomates which demonstrate a deuterostomic pattern of early embryonic development.

脊索动物两侧对称 、 胚层,分节的体腔,在胚胎发育的早期过程中,显示为后口类型.

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There are about 45.000 species of chordates, occupying marine, fresh and brackish water and terrestrial habitats.

有大约45.000种脊索动物,它们占据着海 、 水或淡咸水和陆地的生态环境.

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