第 0714 号，共 1 402 张

Darwin's bark spider

Caerostris darwini

名字的由来： It was named in honour of the naturalist Charles Darwin, on 24 November 2009, exactly 150 years after The Origin of Species was published.1

无害对人无害。不用担心。

蜘蛛

咬伤吃：昆虫

对人的危险: 轻微像被蜜蜂蜇一下或更轻。对人基本无害。

Darwin's bark spider is an orb-weaver that builds the largest orb webs ever seen. It lives in the forests of Madagascar, where it hangs its web over rivers and lakes. Scientists found it in 2009, and it has unusually tough silk.1

生活在

Madagascar, found in Andasibe-Mantadia National Park1

非洲

首页

Builds its web directly above rivers or the water of lakes, a habitat no other spider is known to use. Its webs are large enough to be noticed from a distance.1

长度

2.2 cm (0.9 in)1

最高速度

约 1.1 公里/小时（0.68 英里/小时）

在陆地上, 粗略估计

它吃什么？

Catches insects, including mayflies, that fly over the water and become caught in its web. One web has been seen holding up to 32 mayflies at a time.1

Darwin's bark spider的照片 — Darwin's bark spider。照片：Matjazgregoric。 CC BY-SA 4.0, iNaturalist.

怎样认出它

Females are largely black, with white hairs on the body and legs.1
The top of the front body section has two pairs of raised humps, one at the sides and one towards the back.1
Females are about 1.8 to 2.2 cm long, while males are around 0.6 cm.1
Males are redder and lighter brown, with white hairs and red, hairless leg segments (femora).1
Webs are very large, up to 2.8 square metres, and are strung over water.1

常被误认为： Other Caerostris species live in the same region of Madagascar. Darwin's bark spider has clearly separated epigynal chambers (parts of the female's genital plate) with a pair of hooks at the back, which the other species from the region do not have.1

毒液之力

咬伤

它咬的时候，毒液通过毒牙或牙齿出来。

它对人有多危险？

对人的危险: 轻微像被蜜蜂蜇一下或更轻。对人基本无害。

如果它咬人

清洗咬伤处，用冰袋冷敷止痛。如果疼得厉害、疼痛扩散或感到不适，就去看医生。

一定先拨打你的急救电话（112、000、911）。这里是一般急救指导，不是医疗建议。急救基础

注意安全

永远不要摸、抓或逗弄野生动物，即使是很小的，即使它看起来在睡觉或已经死了。
给它留出空间。如果遇到它，保持冷静，慢慢后退，让它走自己的路。
如果被它咬了：保持冷静，保持不动，拨打你的急救电话（112、000、911）或尽快去医院。记住它长什么样，拍张照片会有帮助。

它不是冲着你来的。它用毒液捕猎或保护自己，而且它更愿意躲起来。更多安全知识

在世界哪里？

非洲亚洲欧洲北美洲南美洲澳大利亚和大洋洲

它有多大？

它有多长？

差不多和一个回形针一样长330 秒就能跑完 100 米（最快的人需要 9.6 秒）

Darwin's bark spider和你比起来有多大？

只是在你的浏览器里算一算。什么都不会被保存或发送到任何地方。

它有多快？

一只陆龟 约 0.3 公里/小时 (0.19 mph)

Darwin's bark spider 约 1.1 公里/小时 (0.68 mph)

一个在走路的人 约 5 公里/小时 (3.1 mph)

值得了解

事实

Its silk is the toughest biological material ever studied. It is over ten times tougher than a similar amount of Kevlar.1

Its web is the largest orb web ever observed, covering up to 2.8 square metres. Its bridge lines can span up to 25 metres.1

The spider uses a set of web-building behaviours that are unknown in other spiders. It releases bridge silk into the air so the wind carries it across the water.1

Females are much larger than males, sometimes many times heavier. This is one of the most extreme size differences between the sexes in spiders.1

Flies that feed on its catches have been found living alongside it, and the spider sometimes chases them away.1