Mean atmospheric O2
Geologic Time Scale
Middle Cambrian Dinomischus
Resembling modern flowers, Dinomischus isolatus populate the ocean floor about 513 million years ago. About four inches tall, Dinomischus isolatus was an animal permanently attached to the ocean floor by a stalk. It probably fed by filtering the surrounding seawater for nutrients, and may have created a current to facilitate this. Its mouth and anus were positioned side-by-side.
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