protochordates

常見例句

• These characteristics are shared by brachiopods and pterobranchs (a hemichordate group) as well as by echinoderms, protochordates, amphioxus, and vertebrates.
  脊索動(dòng)物的祖先可能類似尾索動(dòng)物的幼體，后向兩個(gè)方向發(fā)展，一是經(jīng)過變態(tài)，成體為固著生活，具鰓裂作為取食和呼吸器官；
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