Book lung

In this spider diagram, the position of the book lungs is labelled 1.
Spider book lungs (cross section)
Internal anatomy of a female spider, book lungs shown in pink

A book lung is a type of respiration organ used for atmospheric gas exchange that is present in many arachnids, such as scorpions and spiders. Each of these organs is located inside an open ventral abdominal, air-filled cavity (atrium) and connects with its surroundings through a small opening for the purpose of respiration.


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