第 0675 號，共 1 402 號

Black-footed yellow sac spider

Cheiracanthium inclusum

名字的由來： The common names come from its looks: a pale yellow body, a sac-like silk nest, and dark brown markings on its feet.1

只是會痛會痛，但不會對你造成嚴重傷害。

蜘蛛

咬吃：肉

對人的危險: 疼痛可能會非常痛，但幾乎從來不會很嚴重。

The black-footed yellow sac spider is a small, pale yellow spider native to the Americas. It hunts at night and does not spin webs to catch food. It sometimes lives in homes, but its bites rarely cause more than local symptoms.1

分布在

Native to North, Central and South America and the West Indies. Introduced to Africa and Réunion.1

北美洲, 南美洲

首頁

Most often found in trees and shrubs, including forests and gardens. It may also shelter in houses and other human-made structures.1

長度

2,5 cm (1 in)1

最高速度

大約 0,8 km/h（0,5 mph）

在陸地上, 粗略估計

牠吃什麼？

It feeds on a variety of arthropods, such as insects and other spiders. It does not use webs to catch prey. Instead, it actively hunts, detecting prey mainly through vibrations in the surface it sits on, and it can catch airborne prey while hanging from a silk line.1

Black-footed yellow sac spider 的照片 — Black-footed yellow sac spider。照片：Ilona。 CC BY-SA 4.0, iNaturalist.

怎麼認出牠

Pale yellow-beige body colour.1
Dark brown markings on the palps, jaws (chelicerae) and the ends of the feet (tarsi).1
Often an orange-brown stripe running down the top-centre of the abdomen.1
Eight similar-sized eyes in two parallel horizontal rows.1
Females measure 5 to 9 mm in body length and males 4 to 8 mm. The leg span can reach 2.5 cm, and the front pair of legs is longer than the other three pairs.1

常被誤認為： Cheiracanthium mildei, an introduced species from Europe, is similar in appearance and natural history. It can also be found in North American homes.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？

A bite begins with moderate pain, followed by itching. Symptoms usually clear within 7 to 10 days. The venom rarely causes more than local symptoms.1

牠對人有多危險？

對人的危險: 疼痛可能會非常痛，但幾乎從來不會很嚴重。

Bites are rare. Females bite more often than wandering males. The venom rarely causes more than local symptoms.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

Black-footed yellow sac 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)

Black-footed yellow sac spider 大約 0,8 km/h (0,5 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 hunts at night and builds a new small silk nest every day, in under 10 minutes.1

It can spread to new trees and shrubs by releasing a long silk thread that the wind carries, or by ballooning through the air on a silk line.1

It does not spin a web to catch prey. It hunts actively instead.1

Females mate only once and produce their first egg mass about 14 days after mating.1

破解迷思

迷思： Cheiracanthium bites cause necrosis, the death of skin and tissue.

真相： Bites cause only localised swelling.1

給毒液專家

學名: Cheiracanthium inclusum
類群: 蜘蛛
家人: Cheiracanthiidae2
排序: Araneae
各大洲: 北美洲, 南美洲
寶寶: Females usually lay two egg masses, though they may lay from one to five. Each mass holds 17 to 85 eggs, and up to 112 have been reported. The female guards the eggs and then the young for about 17 days.1
對人的危險: 2 / 5: 疼痛3