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 Dry land
 475 million years ago

Mean atmospheric O2
 63% of modern level

Mean atmospheric CO2
 16x pre-industrial level

Mean temperature
 7C above modern level


Paleozoic Earth - Aquatic arthropods emerging from the sea 475 million years ago; euthycarcinoidea; amphibious arthropods; myriapods; crustaceans; hexapods - Natural History Illustration Geologic Time Scale

Era: Paleozoic
 Period: Ordovician
  Epoch: Early
   Age: Tremadocian


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.

While the 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 terrestrial animals may have been lobster-sized, centipede-like arthropods, perhaps related to amphibious euthycarcinoids.

Also in this image are imagined early terrestrial plants resembling modern liverworts and mosses. 



Copyright Walter B. Myers. All rights reserved.

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