Species
Siamotyrannus isanensis
Siamotyrannus isanensisSiamotyrannus roamed the river valleys and floodplains of what is now northeastern Thailand during the Early Cretaceous. Originally mistaken for the earliest ancestral tyrannosaurid due to traits in its pelvis, paleobiologists now recognize it as an allosauroid hunter within Metriacanthosauridae. Equipped with robust jaws, recurved teeth, and agile bipedal posture, it operated as a key predator tackling juvenile sauropods and other terrestrial vertebrates.
TheropodCarnivore
—observations
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—peak records
ExtinctConservation statusIUCN Red List categoriesLCNTVUENCREWEXExtinctRed List categories, explained →
Diet & preyPhuwiangosaurus (sauropod), Small ornithischians, Freshwater crocodylomorphs
ThreatsClimate shifts and regional ecosystem turnover (extinct)
HabitatsSubtropical river floodplains and open gallery woodlands
Life span20–30 years
Classification
- FamilyMetriacanthosauridae
- SpeciesSiamotyrannus isanensis
Range data is not available yet.
Interaction riskLow
- Low
- Moderate
- High
- Very high
- Why interaction risk is low
- Extinct species known only from fossil remains; safe to observe in museum exhibits.
Responsible observation
- Museum Exhibits: View fossil material and skeletal mounts at the Phu Wiang Dinosaur Museum in Khon Kaen.
- Comparative Anatomy: Note the distinct vertical crests on the dorsal vertebrae that define its lineage.
Prey Ghedoghedo / CC BY-SA 3.0 · cc-by-sa
Neighbor Renata Cunha, Marcos A. F. Sales, Marcel B. Lacerda, Bruno L. D. Horn, Isabel A. P. de Oliveira, Cesar L. Schultz / CC BY-SA 4.0 · cc-by-sa
Close Relative Oxford Museum of Natural History and GB3D Type Fossils Database / CC BY 3.0 · cc-by
Close Relative Ian Armstrong from Travelling the world at moment, Australia / CC BY-SA 2.0 · cc-by-sa
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