第 0682 號，共 1 402 號

Triangulate cobweb spider

Steatoda triangulosa

名字的由來： Its common name comes from the triangle-shaped pattern on the top of its abdomen.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 triangulate cobweb spider is a small, common house spider with a triangle-shaped pattern on its abdomen. It builds messy sticky webs in dark corners of buildings and is found across much of the world. It is a helpful spider that catches many insects and other spiders.1

分布在

Native to Eurasia. Introduced to North America, Argentina, the Canary Islands and South Africa.1

歐洲, 亞洲

首頁

This spider is mainly a house spider. It builds webs in dark corners of buildings and other man-made structures. It is also found in dark places outdoors, often close to the ground and under stones.1

長度

6 mm (0,2 in)1

最高速度

大約 0,74 km/h（0,46 mph）

在陸地上, 粗略估計

牠吃什麼？

It preys on many arthropods, including ants (such as fire ants), other spiders, pillbugs and ticks. It also catches some spiders that are believed to be harmful to humans, including the brown recluse. It catches whatever comes into its web and builds the web to suit the size of its prey.1

Triangulate cobweb spider 的照片 — Triangulate cobweb spider。照片：Patrick Hacker。 CC BY 4.0, iNaturalist.

怎麼認出牠

Adult females are 3 to 6 mm long.1
The cephalothorax (front body section) is brownish-orange.1
The legs are spindly and yellowish, with tiny hairs.1
The round, bulbous abdomen is creamy, with parallel purply-brown zigzag lines running front to back.1
The abdomen pattern includes a triangle shape on its top side.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。

It is not very defensive towards humans. There is one known case of human envenomation.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？

小到可以坐在你的指甲上

Triangulate cobweb 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)

Triangulate cobweb spider 大約 0,74 km/h (0,46 mph)

一個正在走路的人 大約 5 km/h (3,1 mph)

值得知道

小知識

Below or inside its web, there can be many dead insects, from stink bugs to other spiders and even wasps.1

Among the Steatoda spiders, it is one of the most voracious and prey-driven, even though it is one of the smaller species.1

Because of its limited eyesight, it relies mostly on vibrations travelling through its web to find prey and to sense larger animals that could harm it.1

Its egg sac is loosely woven silk and is about the same size as the spider itself.1

It spends hours each day building its web and eats during only part of its day.1

給毒液專家

學名: Steatoda triangulosa
類群: 蜘蛛
家人: Theridiidae2
排序: Araneae
各大洲: 歐洲, 亞洲
寶寶: Each egg sac is about the same size as the spider and holds approximately 30 eggs. Reproduction without males (parthenogenesis) is suspected but not proven.1
牠在野外的狀況: Least Concern1
對人的危險: 1 / 5: 輕微3