book lung

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Related to Book lungs: Spiracles

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 ?
Grammostola rosea showed refined morphological characteristics in its book lungs.
Morphometric diffusing capacity and functional anatomy of the book lungs in the spider Tegenaria spp.
16) accumulation of reaction product is prominent in the zymogen granules of gut diverticula, the ducts of silk glands and the walls of the air pockets in the book lung (Fig.