book lung

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  • noun

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organ in many arachnids containing many thin folds of membrane resembling the leaves of a book

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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.
Spiderlings were covered with a fine mist and the compound was forced into the booklungs.
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.