book lung

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book lung

n.
A saccular respiratory organ found in some arachnids, such as scorpions and spiders, consisting of several parallel membranous folds arranged like the pages in a book.
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Sternites: densely granulose throughout; sternites VI-VII with paired paramedian and lateral carinae, incomplete and granulose; booklung spiracles short and oval.
When the larva hatches they crawl up the spider's legs and enter the booklungs.
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.