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Synapsida
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Synapsida

Group of mammal-like reptiles living 315–195 million years ago, whose fossil record is largely complete, and who were for a while the dominant land animals, before being replaced by the dinosaurs. The true mammals are their descendants.



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Elongated fingers, an opposable "thumb," and a grasping tail of Suminia getmanovi demonstrate that this small plant-eating synapsid is the earliest known tree-climbing vertebrate.
com/kids Timothy Mason's THE LAST SYNAPSID (9780385735810, $16.
This single genus of synapsid, a mammal-like reptile, populated much of Earth for 5 million years.
 
 
 
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