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Protoclepsydrops
Protoclepsydrops was a Synapsid from Carboniferous Nova Scotia.  It was one of the first Synapsids (this group evolved into the mammal-like reptiles) Therapsids, and eventually the true mammals.  It was also one of the first Amniotes (reptiles) and lived alongside other primitive amniotes like Hylonomus and Petrolacosaurus.
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