"book lungs." A Dictionary of Zoology. . Encyclopedia.com. (January 21, 2018). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/book-lungs
"book lungs." A Dictionary of Zoology. . Retrieved January 21, 2018 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/book-lungs
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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." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (January 21, 2018). http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/book-lung
"book lung." The Columbia Encyclopedia, 6th ed.. . Retrieved January 21, 2018 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/book-lung