The Temnospondyl Gerrothorax pulcherrimus, an ~1m long plagiosaurid that lived from the Early to the Late Triassic. Its fossils were found in Germany, Sweden, Greenland, and Thailand. Its existence for such a vast span of time and space, maintaining essentially the same form, reveals a successful animal with good flexibility for its environment - it inevitably needed to be in a body of water, but had good tolerance for the size and salinity of the place. It also probably hunted various species, thus not depending on a specific prey.
Cold porcelain, 1:5 scale.