Mean atmospheric O2
Geologic Time Scale
Several antiarch placoderms from the genus Bothriolepis emerge from a shallow tributary onto dry land 380 million years ago during the Late Devonian. Bothriolepis is believed to have been primarily an aquatic creature, however there's evidence that it may have possessed lungs in addition to gills. Bothropelpis also had jointed arms and a rigid skeleton, leading to speculation that Bothropelpis may have been able to travel over land.
Flora in this scene includes ground mosses, Horsetails and Lycopsids.
Copyright © Walter B. Myers. All rights reserved.
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