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Re: How large insects may have come about
As a layman, a problem I also had with the oxygen hypothesis as
permitting gigantism (before this toxic oxygen avoidance hypothesis)
was that the largest arthropods today, as in the Paleozoic, were
found in the waters, where oxygen is more diluted.
All primarily aquatic arthropods have gills which transfer oxygen to the
blood (hemolymph). Unlike the air in tracheae, blood is actively
transported, so size doesn't matter.
Indeed, don't spiders and scorpions reach bigger maximum sizes than
insects nowadays? Their "book lungs" transfer oxygen to the blood, too.