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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?