Mean atmospheric O2
Geologic Time Scale
First terrestrial arthropods
Aquatic arthropods may have ventured onto dry land as early as the Paleozoic era, with some evidence suggesting it could have been as early as 530 million years ago.
period these land walkers first appeared is yet inconclusive, what these creatures looked like
is even more of a mystery. This speculative image suggests that these first
may have been lobster-sized, centipede-like arthropods, perhaps related to
Copyright © Walter B. Myers. All rights reserved.
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