Any of various primitive aquatic vertebrates of the class Cyclostomata, lacking jaws and including the lampreys and hagfishes.
2
鱼纲冷血水生脊椎动物中的任意一种，具有鳍、鳃和流线体型，尤指包括。
Any of numerous cold-blooded aquatic vertebrates of the superclass Pisces, characteristically having fins, gills, and a streamlined body and including specifically.
3
介形虫，小型水生甲壳纲，出现在几乎所有的海洋，半咸水和淡水栖息地。
Ostracods, small aquatic Crustacea, occur in almost every Marine, brackish and freshwater habitat.
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