Patagotitan mayorum was a gigantic long-necked dinosaur from Patagonia, Argentina, and is one of the largest land animals yet discovered. It lived during the Late Cretaceous Period, about 101 million years ago, when broad floodplains covered parts of South America. Its huge body, long neck, and pillar-like legs show the extreme size reached by titanosaurs, a group of sauropod dinosaurs.
Studying Patagotitan helps scientists understand how life can grow to enormous sizes while still moving, feeding, and surviving on land.
Paleontologists know Patagotitan from many fossil bones, including vertebrae, limb bones, ribs, and parts of the hip and shoulder. By comparing these fossils with more complete sauropod skeletons, scientists reconstruct its shape and estimate its mass, often placing it around 57 metric tons and about 37 meters long. Its bones show adaptations for supporting great weight, while its long neck allowed it to reach large amounts of vegetation without moving its whole body often.
The discovery also reveals that Late Cretaceous Patagonia supported ecosystems rich enough to feed some of the largest herbivores in Earth history.
Key Facts
- Scientific name: Patagotitan mayorum.
- Estimated length: about 37 m from head to tail.
- Estimated mass: about 57 metric tons, though estimates can vary.
- Age: Late Cretaceous, about 101 million years ago.
- Group: Titanosauria, a clade of sauropod dinosaurs with long necks and massive bodies.
- Speed relationship: speed = distance / time, useful for estimating walking pace from trackways.
Vocabulary
- Sauropod
- A group of plant-eating dinosaurs known for long necks, long tails, small heads, and very large bodies.
- Titanosaur
- A sauropod dinosaur from the group Titanosauria, many of which lived during the Cretaceous Period.
- Fossil
- A preserved remain, impression, or trace of an organism from the past.
- Cretaceous Period
- The geologic period from about 145 million to 66 million years ago, ending with the extinction of non-avian dinosaurs.
- Mass estimate
- A scientific calculation of an extinct animal's body mass based on fossil measurements and comparisons with living or extinct animals.
Common Mistakes to Avoid
- Calling Patagotitan the definite largest dinosaur, because size estimates change as new fossils and methods are studied.
- Confusing length with mass, because a longer dinosaur is not always heavier than a shorter but bulkier one.
- Assuming one fossil skeleton was found complete, because Patagotitan is reconstructed from many fossil elements and comparisons with related dinosaurs.
- Imagining Patagotitan as fast and agile, because its enormous mass and column-like limbs suggest slow, energy-efficient movement.
Practice Questions
- 1 Patagotitan was about 37 m long. If a school bus is 12 m long, about how many school buses placed end to end would match its length?
- 2 If Patagotitan had a mass of 57 metric tons and an African elephant has a mass of about 6 metric tons, about how many elephants equal the mass of one Patagotitan?
- 3 Explain why a long neck could help a giant herbivore like Patagotitan feed efficiently on a floodplain without needing to move its entire body constantly.