Genus
Valid Extinct

Mesetasaurus

Soto Núñez et al. 2026

Mesetasaurus is a genus of aeolosaurin titanosaurian sauropod dinosaurs known from the Guichón Formation of Paysandú Department, Uruguay. The genus contains a single species, the type species Mesetasaurus protector, known from two well-preserved caudal vertebrae. It is the second titanosaurian taxon known from its unit and the second non-avian dinosaur described from Uruguay, after the saltasauroid Udelartitan.

Temporal range
Triassic
Jurassic
Cretaceous
Paleogene
Neogene
252 201 145 66 0 Ma
PBDB occurrences
1
Group
Dinosaures
Herbivore Ground dwelling, gregarious Terrestrial
Mesetasaurus
click to enlarge
Mesetasaurus is a titanosaurian sauropod dinosaur that lived during the Late Cretaceous period in what is now Uruguay. Like all sauropods, it stood on four pillar-like legs, using its long neck to reach the vegetation it fed on, counterbalanced by its long tail. Relatively small for a titanosaur, Mesetasaurus grew to approximately 10 m in length. © TotalDino · CC BY 4.0 · Wikimedia
Mesetasaurus
Mesetasaurus
PBDB ↗ Wikipedia ↗
Classification
Dinosauria Unranked clade
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Saurischia Unranked clade
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Sauropodomorpha Unranked clade
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Massopoda Unranked clade
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Sauropodiformes Unranked clade
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Sauropoda Unranked clade
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Gravisauria Unranked clade
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Eusauropoda Unranked clade
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Neosauropoda Unranked clade
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Macronaria Unranked clade
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Titanosauriformes Unranked clade
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Somphospondyli Unranked clade
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Titanosauria Unranked clade
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Lithostrotia Unranked clade
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Aeolosaurini Unranked clade
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Mesetasaurus Genus
Fossil sites 1 geolocated sites
Distribution
Top countries
🇺🇾 Uruguay
1
Geological formations
Guichón
1
Temporal distribution
Campanian (83.6–72.2 Ma)
1
Species (1)
Mesetasaurus protector 86 Ma
Images 2
Bibliography
Original description
M. Soto Núñez, F. Montenegro, and D. Perea. 2026. A NEW AEOLOSAURINI (SAUROPODA, TITANOSAURIA) FROM THE UPPER CRETACEOUS OF URUGUAY. Ameghiniana DOI ↗
Bibliography (1)
M. Soto Núñez, F. Montenegro, and D. Perea. 2026. A NEW AEOLOSAURINI (SAUROPODA, TITANOSAURIA) FROM THE UPPER CRETACEOUS OF URUGUAY. Ameghiniana DOI ↗