Siamotyrannus

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Siamotyrannus
Temporal range:
Ma
Illustration of the pelvic bones and tail vertebrae
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Clade: Saurischia
Clade: Theropoda
Clade: Avetheropoda
Genus: †Siamotyrannus
Buffetaut et al., 1996
Species:
†S. isanensis
Binomial name
†Siamotyrannus isanensis
Buffetaut, Suteethorn & Tong
, 1996

Siamotyrannus (meaning "Siamese tyrant") is a

theropod dinosaur from the early Cretaceous of Thailand
.

Discovery and naming

In 1993, Somchai Traimwichanon found a partial skeleton of a large theropod at the Phu Wiang 9 site in Khon Kaen.

In 1996,

Siam, and a Latinised Greek tyrannus, meaning "tyrant", in reference to a presumed membership of the Tyrannosauridae. The specific name is derived from Thai isan, "northeastern part", referring to the provenance from northeast Thailand.[1]

The

vertebrae, the sacrum with five sacrals, and thirteen front tail vertebrae.[1] In 1998, a tibia and some individual teeth were referred to the species.[2]

Description

Siamotyrannus is a large theropod. Buffetaut estimated its length at seven meters. In 2010, Gregory S. Paul estimated the length at 6 meters (20 ft), the weight at 500 kg.[3] In 2016 Molina-Pérez and Larramendi gave a higher estimation of 10 meters (33 ft) and 1.75 tonnes (1.93 short tons).[4] A possible autapomorphy, unique derived trait, is the possession of two vertical ridges on the ilium. The second and third sacrals are strongly transversely flattened.

Classification

As evidenced by its name, it was originally thought to be a

coelurosaur.[8]

References

  1. ^
    S2CID 7350556
    .
  2. ^ Buffetaut, E. and Suteethorn, V., 1998, "Early Cretaceous dinosaurs from Thailand and their bearing on the early evolution and biogeographical history of some groups of Cretaceous dinosaurs", In: Lucas, Kirkland and Estep, (eds.). Lower and Middle Cretaceous Terrestrial Ecosystems. New Mexico Museum of Natural History Bulletin 14. p. 205-210
  3. ^ Paul, G.S., 2010, The Princeton Field Guide to Dinosaurs, Princeton University Press p. 91
  4. ^ Molina-Pérez and Larramendi (2016). Récords y curiosidades de los dinosaurios Terópodos y otros dinosauromorfos. Barcelona, Spain: Larousse. p. 262.
  5. ^ Rauhut, Oliver W. M. Special Papers in Palaeontology: The Interrelationships and Evolution of Basal Theropod Dinosaurs (No. 69). The Palaeontological Association: 2003
  6. ISBN 0-520-24209-2
  7. S2CID 85354215
    .
  8. doi:10.4202/app.00540.2018
    .
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