Spiracle

Rarity: Common

The most frequent rarity: most Wikipedia articles become Commons.

Rarity follows how well known the article is: its views on the French and English Wikipedia over a year, and the number of languages it exists in.

At a glance

Class

Notion

Domain

Science and technology

In collections

Nobody has pulled it yet.

What Wikipedia says

A spiracle or stigma is the opening in the exoskeletons of insects, myriapods, velvet worms and many arachnids to allow air to enter the trachea. Insect respiratory system differs from vertebrates'.

Excerpt from the Wikipedia article “Spiracle (arthropods)”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Burgess IF, CC BY 2.5, via Wikimedia Commons.