Mean atmospheric O2
Geologic Time Scale
An 8-inch-long primitive jawless fish of the species Drepanaspis gemuendenensis settles on the bottom of a shallow Devonian sea 380 million years ago. With a flat, paddle-shaped head and upwards-facing jawless mouth, Drepanaspis was one of the more unique sea creatures of its time. Based upon its overall shape it is believed to have been a bottom feeder, though it's not known what it would have eaten.
Copyright © Walter B. Myers. All rights reserved.
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