Mastodonsaurus (“breast tooth lizard”) was a Russian and European temnospondyl that belonged to a group of advanced, mostly Triassic amphibians called capitosaurids. It lived in swampy pools and fed mainly on fish, but probably did not avoid land living animals such as small early archosaurids. The giant head was a powerful tool for those feeding habits.
In spite of the discoveries since Starlux closed down, I feel that the old line could be fantastically varied in comparison to some modern line, producing vast numbers of species, not just familiar dinosaurs, but those that existed alongside them. Here, for example, the giant amphibian Mastodonsaurus from the late Triassic, which reached lengths of 13-20 feet long.