I have no idea what kind of a sailback lizard you mean.
If you're refeering to Dimentrodon, I'd say LBT1.
A dinosaur, I'd say Amargasaurus, that can be seen in the last minutes of LBTX.
Also, there's a Baryonyx/Irritator/Suchomimus/Acrocanthosaurus/Spinosaurus in LBTXII. No exact idea of the species.
There's also, in certain episodes, short scenes (often in the opening) showing mamal like reptiles, not sure if any of them belong to the Pelycosaurs (mamal like reptiles with sails).
Not sure if it gives you answer to the question, but that's all I know.
And if you speak of the TV series Episodes, I'm lost since I haven't seen all of them, and don't recall any sailbacked lizard from the ones I've seen.