The pelycosaurs are the ancestral base for all later reptile groups.

Name: The pelycosaurs are the ancestral base for all later reptile groups.
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Although pelycosaurs are part of the larger group of synapsids, which includes some mammal-like reptiles, they are not the ancestral base for all later reptile groups. The archosaurs, which include dinosaurs, birds, and crocodiles, are a separate group that diverged from the lineage leading to pelycosaurs early in reptile evolution.

The Pelycosaurs Are the Ancestral Base for All Later Reptile