book lung


Also found in: Dictionary, Thesaurus, Medical, Wikipedia.

book lung,

terrestrial respiratory organ characteristic of arachnids such as scorpions and primitive spiders. Each book lung consists of hollow flat plates. Air bathes the outer surface of the plates and blood circulates within them, facilitating the exchange of gases. In most species, adequate gas exchange occurs without any muscular movement to ventilate the lung.

book lung

[′bu̇k ‚ləŋ]
(invertebrate zoology)
A saccular respiratory organ in many arachnids consisting of numerous membranous folds arranged like the pages of a book.
References in periodicals archive ?
Keywords: Oxygen consumption, book lungs, mygalomorph spider
The book lungs are two paired organs located within the abdomen of spiders in an inextensible chitinous cavity called the atrium (Foelix 1996).
Glycoprotein staining after using the PAS reaction clearly detailed many delicate deposits of chitin lining chambers of the book lung (Figs.