N any primitive aquatic jawless vertebrate of the class Cyclostomata, such as the lamprey and hagfish, having a round sucking mouth and pouchlike gills 圆口纲脊椎动物
ADJ of, relating to, or belonging to the class Cyclostomata 圆口纲脊椎动物的; 和圆口纲脊椎动物有关的; 属于圆口纲脊椎动物的
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