This is the group of flatworms that cause schistosomiasis .

这是一群会导致血吸虫的扁形虫。

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Flatworms such as these are just one of the 33,000 known species in Japanese waters.

像这样的扁虫只是日本水域中33000已知的物种之一。

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Flatworms such as these are just one of the 33,000 known species in Japanese waters.

像这样的扁虫只是日本水域中33000已知的物种之一。

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