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Re: insects - not! (OT)

David Marjanovic wrote:

This is also true for myriapods*, but not for spiders. Spiders have "book lungs" which transfer oxygen from the air to the blood.

Yeah, I deliberately avoided mentioning arachnids for that reason. However, book lungs exchange oxygen and carbon dioxide mostly through diffusion, without pumping or active ventilation (in most species - there are exceptions). Horseshoe crabs have them too.

* Millipedes, centipedes, a few smaller groups, and probably arthropleurids -- the things that reached a length of ~ 2 m in the Carboniferous and are believed to have munched rotten wood or something, though I don't know why.

Because they were hungry?