cyclostomes

基本解释

possible predecessor of the cyclostomes.
可能是圓口綱脊椎動物的祖先。
eel-shaped vertebrate without jaws or paired appendages including the cyclostomes and some extinct forms.
缺少下巴或成對附器的似鰻的動物包括圓口綱脊椎動物和某些滅絕的種類。
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英寸大小已經滅絕的長有帶鰭尾、脊索和含有細胞質狀骨胳的錐形牙齒似鰻的魚；後寒武紀到後三曡紀的生物；可能是圓口綱脊椎動物的祖先。