Chordates are bilaterally symmetrical , triploblastic , segmented coelomates which demonstrate a deuterostomic pattern of early embryonic development 脊索动物两侧对称、三胚层,分节的体腔,在胚胎发育的早期过程中,显示为后口类型。
英文解释
capable of division into symmetrical halves by only one longitudinal plane passing through the axis 同义词:zygomorphic, zygomorphous,