第 0710 號，共 1 402 號

Joro spider

Trichonephila clavata

名字的由來： Its common name comes from the jorōgumo, a legendary spider in Japanese folklore.1

無害對人無害。不用擔心。

蜘蛛

咬吃：昆蟲

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 Joro spider is a large orb-weaving spider from East Asia. It has spread into parts of the eastern United States since the 2010s. It rarely bites people, and its venom is not medically significant.1

分布在

East Asia (China, Japan except Hokkaidō, Korea, Taiwan); spreading across parts of the eastern United States1

亞洲

首頁

Females build large webs and lay egg sacks on trees. In North America, the spider has also been seen in cities, on streetlamps and telephone poles.1

長度

2,5 cm (1 in)1

最高速度

大約 1,7 km/h（1,1 mph）

在陸地上, 粗略估計

牠吃什麼？

It eats mainly invasive or nuisance insects. It has been seen catching the brown marmorated stink bug, which native spiders in North America have not been known to eat.1

Joro spider 的照片 — Joro spider。照片：Kumon。 CC BY 4.0, iNaturalist.

怎麼認出牠

Adult females have stripes of yellow and dark blue, with red toward the rear of the abdomen.1
Both sexes have a large abdomen and long legs.1
Females are much larger than males: about 1.7 to 2.5 cm, compared with about 0.7 to 1.0 cm for males.1
The web's yellow threads look gold in sunlight. The web has three layers, unusual for an orb web: a central orb, plus two irregular layers in front and behind it.1
Females' webs may reach several metres across.1

毒液力量

咬

咬的時候，毒液會從毒牙或牙齒出來。

牠的毒液有什麼作用？

Its venom is weak. A bite causes temporary pain and redness, which has been compared to a bee sting. The venom is not medically significant.1

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。

Its bite does not pose significant risks to humans. Its fangs are small and it is reluctant to bite, so bites are unlikely.1

牠害怕時會做什麼？

It is reluctant to bite.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 210 秒內跑完 100 公尺（最快的人類需要 9.6 秒）

Joro 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)

Joro spider 大約 1,7 km/h (1,1 mph)

一個正在走路的人 大約 5 km/h (3,1 mph)

值得知道

小知識

Females spin webs several metres long, and their yellow threads look gold in sunlight.1

The name comes from a shape-shifting spider in Japanese folklore that can breathe fire and control other spiders.1

By October 2022, its range covered at least 120,000 km² across several US states.1

In the Ao-Naga people's food tradition, this spider is eaten.1

The spider was first spotted in North America in Hoschton, Georgia, in 2013, and its presence was confirmed in 2014.1

Smaller males are sometimes seen in the females' webs during autumn, when they mate.1

給毒液專家

學名: Trichonephila clavata
類群: 蜘蛛
家人: Nephilidae2
排序: Araneae
各大洲: 亞洲
寶寶: Eggs overwinter, and young emerge in spring. After mating, the female lays 400 to 1,500 eggs in one egg sack on a tree.1
對人的危險: 1 / 5: 輕微3