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Synapsids weren't reptiles?

I am looking at an article in the March 2008 issue of New Scientist. It's a discussion about missing links or something; I seem to be missing the first page.

It says that synapsids "were once" called mammal-like reptiles, bot no more, "because synapsids are not reptiles -- the two groups evolved in parallel from a common ancestor".

What was the common ancestor - an amphibian?

Dora Smith
Austin, TX