This is a cosmopolitan species with a distribution ranging from the Southern Ocean to the North Pacific.
这是一个世界性物种，从南部海洋到北太平洋都有分布。
The floristic element of 61.62% tropical families (excluding the cosmopolitan species), and 36.36% temperate ones reveal dominant tropical property.
在科级分布类型中，热带成分占61.62%（不包括世界广布科），温带成分占36.36%，热带成分具有明显绝对优势；
About 250 species: cosmopolitan, mainly in Asia and Europe; 53 species in China.
大约250种：世界性，主要在亚洲和欧洲；中国有53种。
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