cyclostomes

基本解释

possible predecessor of the cyclostomes.
可能是圆口纲脊椎动物的祖先。
eel-shaped vertebrate without jaws or paired appendages including the cyclostomes and some extinct forms.
缺少下巴或成对附器的似鳗的动物包括圆口纲脊椎动物和某些灭绝的种类。
small (2 in) extinct eellike fish with a finned tail and a notochord and having cone-shaped teeth containing cellular bone; late Cambrian to late Triassic; possible predecessor of the cyclostomes.
2英寸大小已经灭绝的长有带鳍尾、脊索和含有细胞质状骨胳的锥形牙齿似鳗的鱼；后寒武纪到后三叠纪的生物；可能是圆口纲脊椎动物的祖先。