Malarguesaurus (Malarguesaurus florenciae) was a titanosauriform sauropod from the Late Cretaceous of Argentina. Like other sauropods, it was a large, long-necked, plant-eating dinosaur that walked on four pillar-like legs. Malarguesaurus is best known from incomplete fossils, but it adds important information about sauropod diversity in South America near the end of the dinosaur era.
Quick Facts
Scientific name: Malarguesaurus florenciae
Period: Cretaceous (Late Cretaceous deposits)
Diet: Herbivore
Type / clade: Sauropod (titanosauriform)
Lived in: South America (Argentina)
Formation: Portezuelo Formation (Neuquén Group), Mendoza Province
Name Meaning
The name Malarguesaurus means “Malargüe lizard”, referring to the region in Mendoza Province where the fossils were found. The species name florenciae is part of the original scientific naming of the animal.
Discovery and Fossils
Malarguesaurus is known from partial remains that include tail vertebrae, chevrons, ribs, and limb bones. Because the skeleton is incomplete, many details—such as exact body proportions and total size—remain uncertain. The dinosaur was described in the late 2000s based on material collected from Mendoza Province.
Habitat
During the Late Cretaceous, the region represented by the Portezuelo Formation included broad floodplains and river systems. Large herbivores like Malarguesaurus likely moved through open lowlands and woodland edges, feeding on available vegetation and traveling between feeding areas as conditions changed.
Diet
Malarguesaurus was a herbivore. Sauropods generally fed in bulk, consuming large amounts of plant material and processing it through a powerful digestive system. Its long neck may have helped it reach vegetation across different heights or access wide feeding areas efficiently.
Why Malarguesaurus Matters
South America preserves a rich record of Cretaceous sauropods. Even partial finds like Malarguesaurus are valuable because they help paleontologists compare titanosaurs and titanosauriforms across different formations, improving our understanding of how these giant herbivores evolved and diversified.
