Skulls (IMAGE)

Field Museum

Skulls

Caption

Skulls of two ancient mammal relatives, or synapsids, showing the approximate inferred sizes of the ancestors of two of the major synapsid evolutionary diversifications. Varanosaurus (below), from the Permian Period of Earth history, is about the size of the ancestor of all synapsids. Morganucodon (above), from the Jurassic Period of Earth History about the size of the ancestors of most mammals from the Age of Dinosaurs and modern mammals. Both Varanosaurus and Morganucodon fed on other animals. Photo by Ken Angielczyk.

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Photo by Ken Angielczyk.

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