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词汇 Freshwater crab
分类 英语词汇 英语翻译词典
释义

Freshwater crab

中文百科

淡水蟹

溪蟹科的Potamon ibericum,摄于格鲁吉亚
束腰蟹科的Parathelphusa convexa',摄于印尼
春蟹(Potamon fluviatile)的卵,内为完整发育的幼虫

世上大约有1300种淡水蟹英语:Freshwater crab),分布于热带与亚热带,包含八个科。牠们多为直接发育(即没有经过幼虫期)且有育幼行为,后代不是很多,海水蟹则相较之下常产生比较多浮游性幼虫。这限制了淡水蟹的传播能力,使牠们的活动通常被局限在一个小区域,而有许多特有种,也有许多物种陷入濒危。

英语百科

Freshwater crab 淡水蟹

Potamon ibericum (Potamidae) in Georgia
Parathelphusa convexa (Parathelphusidae) in Indonesia
Eggs of Potamon fluviatile containing fully formed juvenile crabs

There are around 1,300 species of freshwater crabs, distributed throughout the tropics and subtropics, divided among eight families. They show direct development and maternal care of a small number of offspring, in contrast to marine crabs which release thousands of planktonic larvae. This limits the dispersal abilities of freshwater crabs, so they tend to be endemic to small areas. As a result, a large proportion are threatened with extinction.

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