Pronunciation: Sore-oh-soo-kus Meaning of name: "Lizard crocodile". Species: S. galilei Size: Estimated to have measured between 6 and 9 metres long and weighing between 1 and 2 metric tonnes. Family: Prestosuchidae Diet: Carnivore First fossils found: Known from numerous partial specimens discovered in the Ischigualasto Formation of San Juan Province, northwestern Argentina. First discovered in 1957 and named by Osvaldo Reig in 1959. Lived: 237 to 227 million years ago during the Carnian stage of the Late Triassic in what is now northwestern Argentina.
Pronunciation: Am-fee-cie-on Meaning of name: "Ambiguous dog". Species: A. frendens, A. galushai, A. giganteus, A. ingens, A. laugnacensis, A. longiramus, A. lydekkeri, A. major, A. palaeindicus Size: Depending on species, measured up to 2.5 metres long and weighing up to 630kgs. Family: Amphicyonidae Diet: Mostly carnivorous. First fossils found: Known from several specimens discovered in Europe, Africa, the USA and Asia. A. major named in 1841. A. giganteus named in 1884. A.palaeindicus named in 1876. A. lydekkeri named in 1910. A. frendens and A. ingens named in 1924. A. longiramus named in 1942. A. laugnacensis named in 1989. A. galushai named in 2003. Lived: Depending on species, lived between 16.9 and 2.6 million years ago from the Burdigalian stage of the Early Miocene through to the Gelasian stage of the Early Pleistocene in what is now Asia, Europe, Africa and the USA.
Pronunciation: Py-roe-thee-re-um Meaning of name: "Fire beast". Species: P. romeroi, P. macfaddeni Size: Depending on species, measured between 3 and 3.5 metres long and weighing between 3 and 4 metric tonnes. Family: Pyrotheriidae. Diet: Herbivore. Fed on low-growing vegetation. First fossils found: Known from several specimens discovered in the Sarmiento Formation of central Patagonia, Argentina and the Sella Formation of southern Bolivia. P.romeroi named by Argentinian palaeontologist, Florentino Ameghino, in 1888. P. macfaddeni named in 2004. Lived: Depending on species, lived between 33.9 and 28.1 million years ago during the Rupelian stage of the Early Oligocene in what is now southern Bolivia and central Patagonia, Argentina.