第 1061 號，共 1 402 號

Wheel bug

Arilus cristatus

只是會痛會痛，但不會對你造成嚴重傷害。

咬吃：肉

The wheel bug is a large assassin bug with a wheel-shaped crest on its back. It is the only wheel bug found in the United States, and it hunts caterpillars and beetles. Gardeners value it because it helps keep pests down.1

分布在

Eastern Canada, the United States, Mexico and Guatemala1

北美洲

首頁

It lives in leafy areas and is most active in daylight, hiding whenever it can. It is found on sunflowers, goldenrod, cotton, locust tree trunks, and in fruit and tree groves.1

長度

3,8 cm (1,5 in)1

最高速度

大約 0,65 km/h（0,4 mph）

在陸地上, 粗略估計

牠吃什麼？

It grips and pins prey with its front legs, then pushes its beak into the victim. It injects enzymes that paralyse the prey and dissolve its insides, then drains the fluids. It commonly preys on caterpillars and beetles, including Japanese beetles and Mexican bean beetles.1

Wheel bug 的照片 — Wheel bug。照片：gailhampshire。 CC BY 4.0, iNaturalist.

怎麼認出牠

Adults are grey to brownish grey, and black shortly after moulting.1
Adults have a wheel-shaped or cog-shaped ridge on the back of the thorax. Young nymphs do not have this wheel yet.1
Nymphs have a bright red or orange abdomen.1
Adults can grow up to 38 mm long. Females are somewhat larger than males.1
They move and fly slowly, and make a noisy buzzing sound in flight.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？

The bug injects enzymes into its prey that paralyse it and dissolve its insides. Its bite is not considered highly venomous. In people, the bite causes a wound that is very painful and lingering, with the area becoming hot and irritated, and numbness that can last for days.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。

The bite is not considered highly venomous, so it is not serious in the short term. Discomfort may last for two weeks, and in some cases up to six months. Longer-lasting problems are often linked to allergic reactions or repeated infections of the wound.1

牠害怕時會做什麼？

When threatened, it relies on camouflage, its bite, or unpleasant odours from two scent glands in its abdomen.1

如果牠咬人

被會螫人的毛毛蟲毛刺到時：用膠帶把毛黏起來，再清洗皮膚。不要搓揉。
被咬時：清洗並冷敷。如果傷者覺得不舒服或容易流血，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

Wheel bug 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)

Wheel bug 大約 0,65 km/h (0,4 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 is cannibalistic. Nymphs may prey on each other, and a female may feed on the male after mating.1

It can make a sound by rubbing the tip of its beak in a groove under its thorax. The purpose is unknown, but it may be a way of communicating.1

Nymphs are predators as soon as they hatch, but the wheel only appears after the final moult into adulthood.1

It can prey on useful insects such as lady beetles and honey bees, as well as pests.1

It is one of the largest true bugs in North America.1

In a laboratory test, parasitic wasps attacked 10 of 12 egg clusters, stopping many eggs from hatching normally.1

給毒液專家

學名: Arilus cristatus
類群: 毛毛蟲和其他蟲子
家人: Reduviidae2
排序: Hemiptera
各大洲: 北美洲
寶寶: After mating in autumn, a female lays 40 to 200 small, brown, cylindrical eggs in a glued cluster on trees, bushes, twigs and other objects. The eggs hatch the following spring.1
對人的危險: 2 / 5: 疼痛3