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尾海鞘綱是尾索動物亞門的一個綱，又名幼形綱。體小如蝌蚪，自由游泳生活，一對鰓裂，具背神經管和尾索。如尾海鞘、住囊蟲。現存60多種，中國四大海域都有此類動物。
本綱包括以下科：
- 住筒蟲科 Fritillariidae
- 科氏蟲科 Kowalevskiidae
- 住囊蟲科 Oikopleuridae
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