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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]
A saccular respiratory organ in many arachnids consisting of numerous membranous folds arranged like the pages of a book.
References in periodicals archive
Sternites: densely granulose throughout; sternites VI-VII with paired paramedian and lateral carinae, incomplete and granulose; booklung
spiracles short and oval.
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.
Area between booklungs
covered with smooth orange sternite continuous with epigynum; spermathecae separated by less than their width; epigynum with median trapezoidal plate at posterior margin (Fig.