Mean atmospheric O2
Geologic Time Scale
A 12-inch-long armored antiarch placoderm from the genus Bothriolepis glides along the bottom of a flooded plain 380 million years ago during the Late Devonian. Plant life includes the bases of giant Archaeopteris ferns, trunks of smaller Lycopods, and rope-like horsetails. Leaf-like filter feeders are also included, as well as ambiguous caterpillar-like plants, though it's not known if either were extant at this time.
With its heavy armor and large mouth, Bothriolepis is believed to have been a bottom feeder, living off of decomposing organic matter that settled on the foundations of its habitats. Like modern day salmon, Bothriolepis may have spent most of its life in saltwater, returning to freshwater only to breed.
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