第 0706 號，共 1 402 號

Raft spider

Dolomedes fimbriatus

名字的由來： The genus name Dolomedes is from Greek and is translated as crafty or wily.1

無害對人無害。不用擔心。

蜘蛛

咬吃：肉

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。

The raft spider is a large spider that lives partly in the water. It is found across north-western and central Europe, mostly in wet heaths and swampy places. It is one of only two Dolomedes spiders found in Europe.1

分布在

North-western and central Europe1

歐洲, 亞洲

首頁

Adults live in freshwater wetlands, especially wet heaths and acid swamps. Juveniles are mostly found in the plants on land around wetland areas.1

長度

2,2 cm (0,9 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 eats freshwater invertebrates such as water beetles, pond striders and dragonfly larvae. It hunts on the water surface and detects prey through vibrations in the water. Occasionally it eats small vertebrates such as sticklebacks and small frogs.1

Raft spider 的照片 — Raft spider。照片：LithobiusOrigins。 CC BY-SA 4.0, Wikimedia Commons.

怎麼認出牠

Adults are dark brown with a white, cream or yellow stripe along both sides of the abdomen and thorax.1
Juveniles look similar but often have green translucent legs.1
Females are usually larger than males.1
Hunts on the surface of the water with its front legs outstretched.1

常被誤認為： The only other Dolomedes spider in Europe is Dolomedes plantarius, which is slightly larger. It is endangered in the UK.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。

牠害怕時會做什麼？

To escape birds, it can fully submerge itself in water and has been known to hide underwater for several minutes.1

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？

大約跟一根迴紋針一樣長可以在 280 秒內跑完 100 公尺（最快的人類需要 9.6 秒）

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)

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

This spider is one of the few species known to attack nearly almost all approaching males, which biologists consider unusual because it can stop mating from succeeding.1

The raft spider can stay hidden underwater for several minutes.1

Females will sometimes eat the male before, during or immediately after mating.1

Males signal their presence to the female by using vibrations on her dragline, which may help them avoid being attacked.1

給毒液專家

學名: Dolomedes fimbriatus
類群: 蜘蛛
家人: Dolomedidae2
排序: Araneae
各大洲: 歐洲, 亞洲
寶寶: The female carries her fertilised egg sac, then places it in a silken nursery tent she has made. She guards the nursery until the spiderlings are ready to leave.1
對人的危險: 1 / 5: 輕微3