第 0707 號，共 1 402 號

Fen raft spider

Dolomedes plantarius

無害對人無害。不用擔心。

咬吃：肉

The fen raft spider is a large spider that lives on the edges of still, slow-moving water in Europe. It hunts from plants at the water's edge and can even run across the surface of a pond. It is rare, and it is protected in many places.1

分布在

Throughout Europe and Russia, including the UK, Scandinavia, France and Germany1

歐洲

首頁

It lives in lowland fens and grazing marshes, usually on the edges of pools or ditches. It needs standing or slow-moving water that is neutral to alkaline, and it avoids places where the water is shaded. Tall plants that stick out of the water are important for perching, basking and building nursery webs.1

長度

7 cm (2,8 in)1

最高速度

大約 1,3 km/h（0,81 mph）

在陸地上, 粗略估計

牠吃什麼？

It hunts from perches at the water's edge. It feeds mainly on water insects such as pond skaters and dragonfly larvae, smaller water spiders and small fish. It also takes drowning land insects and small animals such as sticklebacks and tadpoles.1

Fen raft spider 的照片 — Fen raft spider。照片：Thomas Gyselinck。 CC BY 4.0, iNaturalist.

怎麼認出牠

It is a large spider within its range. Adult females have bodies slightly over 2 cm long and a leg span of about 7 cm.1
It is usually black or brown, with white or cream stripes along the sides of the body.1
It is often found sitting on plant stems at the water's edge, with its back legs on a stem and its front legs on the water.1

常被誤認為： It is very similar in appearance to the closely related raft spider, Dolomedes fimbriatus, and the two are often misidentified. Identification can be difficult.1

毒液力量

咬

咬的時候，毒液會從毒牙或牙齒出來。

牠對人有多危險？

對人的危險: 輕微跟蜜蜂螫差不多或更輕微。對人基本上無害。

如果牠咬人

清洗咬傷處，用冰敷袋冰敷止痛。如果很痛、疼痛擴散或傷者覺得不舒服，要就醫。

一定要先打緊急電話（112、000、911）。這是一般急救指引，不是醫療建議。急救基本知識

注意安全

絕對不要碰、抓或捉弄野生動物，就算是很小的動物，就算牠看起來在睡覺或已經死了也一樣。
給牠空間。如果遇到了，保持冷靜，慢慢往後退，讓牠自己離開。
如果被牠咬了：保持冷靜，保持不動，打緊急電話（112、000、911）或趕快去醫院。記住牠的樣子，有照片會很有幫助。

牠不是想來抓你。牠用毒液來捕捉食物或保護自己，而且牠更想躲起來。更多安全知識

在世界上的哪裡？

非洲亞洲歐洲北美洲南美洲澳洲與大洋洲

牠有多大？

牠有多長？

跟 2 塊玩具積木排成一排一樣長可以在 280 秒內跑完 100 公尺（最快的人類需要 9.6 秒）

Fen raft spider 跟「你」比起來有多大？

只是在你的瀏覽器裡做算術。什麼都不會儲存，也不會傳送到任何地方。

牠有多快？

一隻陸龜 大約 0,3 km/h (0,19 mph)

Fen raft spider 大約 1,3 km/h (0,81 mph)

一個正在走路的人 大約 5 km/h (3,1 mph)

值得知道

小知識

It can run across the surface of water by using surface tension, the force that keeps the water's skin intact.1

It can also hunt underwater by running down plant stems, and it can use this route to escape predators.1

It detects prey using sensory hairs on its legs, which pick up the vibrations made when prey hits the water.1

Before hatching, the female builds a tent-like nursery web on plants above the water, where she guards the young.1

In 2010, around 1,600 hand-reared spiderlings were released at a new UK site, which were fed on fruit flies.1

Males mate early in the season and most die by late July. Females survive until the end of summer.1

給毒液專家

學名: Dolomedes plantarius
類群: 蜘蛛
家人: Dolomedidae2
排序: Araneae
各大洲: 歐洲
寶寶: The female lays several hundred eggs in a silk sac about 10 mm across, which she carries under her body for around three weeks.1
壽命: 大約 2,5 年1
牠在野外的狀況: Vulnerable (IUCN Red List). In the UK it is Nationally Rare and protected by law.1
對人的危險: 1 / 5: 輕微3