Genus
Valid Extinct

Siats

Zanno and Makovicky 2013

Siats (/see-ats/) is an extinct genus of large theropod dinosaurs known from the Late Cretaceous Cedar Mountain Formation of Utah, United States. The genus contains a single species, Siats meekerorum. It was initially classified as a megaraptoran, a clade of large theropods with controversial relationships. Alternative positions within the Neovenatoridae, Allosauroidea, and Tyrannosauroidea have also been proposed.

Temporal range
Triassic
Jurassic
Cretaceous
Paleogene
Neogene
252 201 145 66 0 Ma
PBDB occurrences
1
Group
Dinosaures
Carnivore Ground dwelling, solitary Terrestrial
Siats
click to enlarge
Skeletal diagram of known remains of Siats meekerorum. Silhouette adapted from https://en.wikipedia.org/wiki/File:Neovenator_Scale.png © Silhouette by DaCaTaraptor. diagram by Paleocolour. · CC BY-SA 4.0 · Wikimedia
PBDB ↗ Wikipedia ↗
Classification
Dinosauria Unranked clade
›
Theropoda Unranked clade
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Neotheropoda Unranked clade
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Averostra Unranked clade
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Tetanurae Unranked clade
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Coelurosauria Unranked clade
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Megaraptora Unranked clade
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Siats Genus
Measurements
Length
10,2 m ⓘ
Siats meekerorum
Mass
3 400 kg ⓘ
Siats meekerorum
Fossil sites 1 geolocated sites
Distribution
Top countries
🇺🇸 United States
1
Geological formations
Cedar Mountain
1
Temporal distribution
Cenomanian (100.5–93.9 Ma)
1
Species (1)
Siats meekerorum 101 Ma
News 1
Siats: Beast of the Week
Siats: Beast of the Week
United States Cretaceous Dinosauria Siats
This week belongs to a mysterious theropod dinosaur.  Check out Siats !  Siats was a large, meat-eating dinosaur that lived in what is now Utah, USA,  during the middle Cretaceous period, about 98 million years ago.  The individual found would have been about 30 feet (9 meters) long from snout to tail, but appeared to have been still growing when it died so it may have been able to grow larger.  The genus name is after a terrifying man-eating monster from the local Ute tribe's mythology, called
02/11/2026 prehistoricbeastoftheweek
Images 1
Bibliography
Original description
L. E. Zanno and P. J. Makovicky. 2013. Neovenatorid theropods are apex predators in the Late Cretaceous of North America. Nature Communications 4:1-9 DOI ↗
Bibliography (1)
L. E. Zanno and P. J. Makovicky. 2013. Neovenatorid theropods are apex predators in the Late Cretaceous of North America. Nature Communications 4:1-9 DOI ↗