Teratosaurus

Teratosaurus Temporal range: Late Triassic, 216–204 Ma PreЄ Є O S D C P T J K Pg N
Teratosaurus suevicus
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Infraclass:	Archosauromorpha
(unranked):	Crurotarsi
Order:	Rauisuchia
Family:	Rauisuchidae
Genus:	Teratosaurus von Meyer, 1861
Species
T. suevicus von Meyer, 1861 (type)

Teratosaurus (Gr. teras "monster" + sauros "lizard") was a genus of rauisuchian known from the Triassic Stubensandstein (Löwenstein Formation - Norian age) of Germany. The type specimen was described by von Meyer on the basis of a left maxilla (upper jaw bone) with large teeth, which he declared to be distinct from Belodon.

Later authors, such as von Huene, Osborn, and Edwin H. Colbert, incorrectly attributed postcrania of the sauropodomorph dinosaur Efraasia to this species, and as a result it was thought to be a very primitive theropod. Following this lead, many popular books in the 20th century depicted "teratosaurs" as the earliest sort of large bodied meat-eating dinosaur, walking on two legs and preying on the prosauropods of its day. It was thought by many to be a Triassic ancestor to the carnosaurs of the Jurassic.

In 1985 and 1986 Peter Galton and Michael Benton independently showed that Teratosaurus is actually a nondinosaurian rauisuchian, a type of large predatory archosaur which lived alongside dinosaurs during the Late Triassic.^[1][2]

T. silesiacus, described in 2005 by Tomasz Sulej,^[3] was transferred to genus Polonosuchus by Brussatte et al. in 2009.^[4]

References

1. ^ Galton, P. M. (1985). "The poposaurid thecodontian Teratosaurus suevicus von Meyer, plus referred specimens mostly based on prosauropod dinosaurs". Stuttgarter Beitrage zur Naturkunde, B, 116: 1-29.
2. ^ Benton, M.J. (1986). "The late Triassic reptile Teratosaurus - a rauisuchian, not a dinosaur". Palaeontology 29: 293-301.
3. ^ Sulej, T. (2005). "A new rauisuchian reptile (Diapsida: Archosauria) from the Late Triassic of Poland." Journal of Vertebrate Paleontology, 25(1):78-86.
4. ^ Brusatte, Stephen L.; Butler, Richard J.; Sulej, Tomasz; Niedźwiedzki, Grzegorz (2009). "The taxonomy and anatomy of rauisuchian archosaurs from the Late Triassic of Germany and Poland". Acta Palaeontologica Polonica 54 (2): 221–230. doi:10.4202/app.2008.0065. 

• On the Classification of the Dinosauria with Observations on the Dinosauria of the Trias - Quarterly Journal of the Geological Society (1870) Scientific Memoirs III

External links

Paleontology portal

• Palaeos Mesozoic - Norian
• Rauisuchia Translation and Pronunciation Guide by Ben Creisler