アメリカ自然史博物館のインスタグラム(amnh) - 1月24日 00時51分

Meet a mysterious mammal relative on this #FossilFriday.
Edaphosaurus boanerges is a distant relative of mammals. The fossil record indicates that it was one of the most common large animals in North America roughly 260 million years ago, about 30 million years before the first dinosaurs. Edaphosaurus, like Dimetrodon, had a sail on it’s back. The two species, however, are not closely related. Their sails are structurally disparate and probably evolved independently. This structural difference only increases the mystery surrounding the function of the sails.
This fossil was collected in Archer County, Texas, and can be found in the Museum’s Hall of Primitive Mammals.

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