古口目（Archaeognatha）這個名稱源自希臘語 ἀρχαῖος（archaios），意為「古老」，和 γνάθος（gnathos），意為「下顎」。這指的是它們的下顎關節，與其他昆蟲不同。它是最原始的昆蟲之一（起源於3.9億年前）。

The name Archaeognatha is derived from the Greek ἀρχαῖος, archaios, meaning 'ancient', and γνάθος, gnathos, meaning 'jaw'. This refers to the articulation of the mandibles, which are different from those of other insects. It is one of the most primitive insects (origin 390 million years ago) 

種的俗名 Common names of members

石蛃

Jumping bristletails

分佈 Distribution  

除了南極洲外，分布於每個大洲。

Every continent except Antarctica

形態描述 Morphology

無翅

體型細長，背部弓形

長觸角

眼睛在頭頂相接

三個長尾狀結構，中間的更長

Wingless

Body elongated and back arched

Long antennae

Eyes meeting on the top of the head

Three long tail-like structures, with the middle one longer

生態與棲息地 Habitat & Ecology

森林（落葉層和石縫之間）及海岸。

Forest (leaf litter and among stones) and seashore

食性 Diet

藻類、苔蘚和地衣

Algae, Lichen, and Mosses

小知識 Fun Fact