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动物的一纲 来自维基百科,自由的百科全书
尾海鞘纲是尾索动物亚门的一个纲,又名幼形纲。体小如蝌蚪,自由游泳生活,一对鳃裂,具背神经管和尾索。如尾海鞘、住囊虫。现存60多种,中国四大海域都有此类动物。
本纲包括以下科:
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