English: Tiamat is a basal titanosaurian sauropod dinosaur from the Cretaceous of what is now Brazil. It is named after the "mother of dragons" of Babylonian and Sumerian mythologies, referring to Tiamat being a relatively early member of the titanosaurs, as well as its discovery shedding some light on early titanosaur dispersal across the southern hemisphere and the rest of the world. Like all sauropods, Tiamat was a quadrupedal herbivore with a long neck and tail.