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標題: [Others] 水熊蟲 Water Bear (緩步動物門 Phylum Tardigrada) [打印本頁]

作者: littlelittle 時間: 2016-3-1 15:09 標題: 水熊蟲 Water Bear (緩步動物門 Phylum Tardigrada)

被稱為最頑强的生物 - 暴露在真空、1200倍大氣壓力、151°C 、−200 °C 、高強度輻射...都能生存。算是生物界明星，甚至被卡通化、製成毛公仔。

近期每星期都見，開始明白點解啲人點解咁喜歡佢。

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作者: littlelittle 時間: 2016-3-1 15:27

上埋短片先

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作者: kingarthur 時間: 2016-3-1 17:48

True survivor!

作者: kili01 時間: 2016-3-2 11:43

請問在香港哪種生境可見到它？另外，肉眼可否見到或辦認到它？謝謝。

作者: littlelittle 時間: 2016-3-2 16:35 標題: 回覆 #4 kili01 的帖子

潮濕的苔蘚上、溪水生境水藻團中。部份品種可達一毫米大，肉眼勉強可見，準確辨認當然有些困難。

作者: Aland 時間: 2016-3-3 00:20 標題: 回覆 #5 littlelittle 的帖子

多謝分享！
我聽聞tardigrades在野外其實頗為常見，只是經常被忽略？

加多少少資料:
The phylum tardigrada is a member of the panarthropods, a group that includes the arthropods, tardigrades, and onychophorans, which are all legged ecdysozoans. If I remembered it correctly, such classification arose before molecular evidence, but recent analysis of DNA sequences does support the panarthropods forming a monophyletic group.

Regarding the evolution of the tardigrades, a very recent paper (published just last month) provided some new insights. The paper investigated into the Hox genes (genes controlling body plan) of the three panarthropod groups. It turns out that the tardigrades lost a whole segment of their body. The majority of the segments in tardigrades are analogous to the head segments of the arthropods. This probably lead to the compact body structure seen in tardigrades today.

有關研究：
http://www.sciencedirect.com/science/article/pii/S0960982215015079

（用中文好難寫phylogenetic analysis，請見諒）

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