| 1. | Both their book lungs and the anterior median eyes.
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| 2. | The bottom side of the abdomen is usually brown with yellow book lungs.
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| 3. | Book lungs are not related to the lungs of modern land-dwelling vertebrates.
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| 4. | The unfolded " pages " ( plates ) of the book lung are filled with hemolymph.
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| 5. | See branchiostegal lung and book lung.
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| 6. | Recent Mesothelae are characterized by the narrow mygalomorph spiders, they have two pairs of book lungs.
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| 7. | The respiratory system consists only of book lungs, which could help explain why they are relatively inactive.
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| 8. | In a very few species the book lungs have developed deep channels, apparently signs of evolution into tracheae.
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| 9. | Unlike almost all other araneomorph or " true " spiders, members of the family have four book lungs.
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| 10. | Like the " primitive " suborder of spiders Mesothelae, they have two pairs of book lungs, and downward pointing chelicerae.
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मोबाइल