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Placostraca (lit. "plate shells") are a clade of herbivorous Diplostoma.

DescriptionEdit

First emerging around 4180ma, Placostracans are the earliest group of large-sized terrestrial herbivores.

DeclineEdit

The emergence of the Megalobrachids resulted in the extinction of many large Placostracan species, with the remaining species evolving into the Euplacostraca branch.

The emergence of the steppe went alongside a decrease in global oxygen levels, causing the Placostracans to shrink in size.

NavigationEdit

Evolutionary Tree
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