I based him on elements of both the original Terrorsaur and the Transmetal version. Since Starscream's the resident traitor, I imagine Terrorsaur as a sort of foul, bestial glutton who... well, does what his name implies. Terrorizes. Thus, I gave him this wide maw full of razor teeth. The wing claws wrapping around his chest like that come from Magmatron, which I thought would work really well here.