book lung

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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 ?
This has been strongly refuted by Scholtz and Kamenz (2006) who argue that booklungs are an apomorphy of Araneae, that the Araneae are monophyletic and that they resulted from a single terrestrialisation event in their common stem lineage.
booklungs: Folded, accordian-like respiratory organs where gas exchange takes place.
Once a host is found, the planidium climbs on to the spider, migrates to the spider's abdomen, and cuts a small hole to enter the spider en route to the booklungs (Schlinger 1987; see Nielsen et al.