Is there a missing link between reptiles and amphibians?

Is there a transitional species between a amphibian tetrapod and a reptillian amniote?

Saurian synapsids, right? I know there were two kind of synapsids, one branch of which was the mammalian synapsids and the other the ancestors of birds and reptiles.

Edit: I don’t know much about them myself, sorry, but at least I can give you a starting point

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here i found a whole list of them

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