Argentinosaurus
Giant titanosaur from Early Cretaceous Argentina.
Argentinosaurus (meaning 'lizard from Argentina') is a genus of giant sauropod dinosaur that lived during the Early Cretaceous period in what is now Argentina. It was a member of Titanosauria, the dominant group of sauropods during the Cretaceous.
- field
- Paleontology
- known_for
- One of the largest known land animals
- mass
- 65–80 t (72–88 short tons)
- period
- Early Cretaceous
- location
- Argentina
Lore & Background
Additional specimens include a complete femur and the shaft of another. The fragmentary nature of Argentinosaurus remains makes their interpretation difficult. Arguments revolve around the position of the recovered vertebrae within the vertebral column and the presence of accessory articulations between the vertebrae that would have strengthened the spine. A computer model of the skeleton and muscles estimated this dinosaur had a maximum speed of 7.2 km/h (5 mph) with a pace. The fossils were recovered from the Huincul Formation, which was deposited in the Albian stage and contains a diverse dinosaur fauna, including the giant theropod Mapusaurus.
Reader's Guide
Argentinosaurus is significant as one of the largest known land animals, though its exact size is debated due to fragmentary remains. It represents the titanosaurian sauropods that dominated the Cretaceous. The discovery and naming by Argentine paleontologists highlight the rich fossil record of South America. The Huincul Formation provides context for a diverse dinosaur ecosystem, including the large predator Mapusaurus. Despite uncertainty over whether it was the largest titanosaur—with contenders like Patagotitan and Puertasaurus—Argentinosaurus remains a key reference for understanding sauropod gigantism. Its fossils, though limited, continue to inform debates on vertebral anatomy, locomotion, and body mass estimation methods.
Did You Know?
- A computer model estimated Argentinosaurus had a maximum speed of 7.2 km/h (5 mph) using a pace gait.
- The species name A. huinculensis refers to the town Plaza Huincul, near where the fossils were found.
- The fossils were recovered from the Huincul Formation, which also contains the giant theropod Mapusaurus.
Frequently Asked Questions
What is Argentinosaurus?
Argentinosaurus is a genus of enormous sauropod dinosaur whose name literally means 'lizard from Argentina.' It was a four-legged, long-necked herbivore belonging to the Titanosauria family and is recognized as one of the largest land animals ever identified.
How big was Argentinosaurus?
Paleontologists estimate its body mass at roughly 65 to 80 tonnes, placing it firmly among the heaviest terrestrial creatures in the fossil record. That scale is a key reason it frequently tops 'largest dinosaur' lists in fan communities.
When and where did Argentinosaurus live?
It roamed the landscapes of what is now modern-day Argentina during the Early Cretaceous period. All known fossil material for the genus comes from that South American region.
What group of dinosaurs did Argentinosaurus belong to?
It was a member of Titanosauria, the sauropod lineage that dominated land ecosystems throughout the Cretaceous. As a titanosaur, it shared the stocky-body, long-neck body plan that defined the era's biggest herbivores.
Why is Argentinosaurus significant in paleontology?
Its fossils provided concrete evidence that Early Cretaceous South America hosted some of the most massive land animals in Earth's history. It also cemented Titanosauria's status as the ruling sauropod group of the Cretaceous, shaping how we understand the era's ecosystems.
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