Brontosaurus
Thunder lizard of the Late Jurassic, long debated as distinct from Apatosaurus.
Brontosaurus (literally 'thunder lizard') is a genus of herbivorous sauropod dinosaur that lived in present-day United States during the Late Jurassic period. excelsus. For decades, the animal was thought to be a taxonomic synonym of its close relative Apatosaurus, but a 2015 study found it to be distinct. It has seen widespread representation in popular culture as the archetypal 'long-necked' dinosaur.
- field
- Paleontology
- nationality
- United States (Morrison Formation of Utah and Wyoming)
- known_for
- Large, long-necked sauropod; type species B. excelsus; subject of the 'Bone Wars' rivalry
- size
- Largest species B. excelsus up to 21–23 m (69–75 ft) long, 15–20 t (17–22 short tons); smaller B. parvus up to 19 m (62 ft)
Lore & Background
The mount used a sculpted skull based on Camarasaurus, as no Brontosaurus skull was known at the time. In 2015, a comprehensive study by Emmanuel Tschopp and colleagues found Brontosaurus to be distinct, placing it in the subfamily Apatosaurinae. However, the status of Brontosaurus is still uncertain, with some paleontologists still considering it a synonym of Apatosaurus.
Reader's Guide
Brontosaurus holds a significant place in both paleontology and popular culture. Its discovery during the Bone Wars highlighted the competitive and often rushed nature of early dinosaur research. The long-standing debate over its validity as a genus—resolved in 2015 but still contested—illustrates the evolving nature of taxonomic classification. As the archetypal 'long-necked' dinosaur, it has shaped public perception of sauropods. Its anatomy, including robust cervical vertebrae and a whip-like tail, distinguishes it from relatives like Diplodocus. The Morrison Formation, where Brontosaurus lived, was a hotspot of sauropod biodiversity, with niche partitioning among over 16 recognized genera. The species B. excelsus reached up to 23 m in length, while juveniles grew rapidly to adult size in as little as 15 years.
Did You Know?
- The name Brontosaurus means 'thunder lizard' from Greek brontē (thunder) and sauros (lizard).
- A 2015 study by Emmanuel Tschopp and colleagues found Brontosaurus to be distinct from Apatosaurus, though some paleontologists still consider it a synonym.
Common Misconceptions (Editorial)
Some people think Brontosaurus was a fictional or invalid dinosaur for most of the 20th century, but the facts show it was simply considered a synonym of Apatosaurus until a 2015 study reestablished it as a distinct genus. Another common misconception is that no Brontosaurus skull was ever found; in fact, the early mounted skeleton used a sculpted skull based on Camarasaurus because no Brontosaurus skull was known at the time.
Why It Matters (Editorial)
Brontosaurus endures because it perfectly embodies the cultural image of the massive, gentle long-necked dinosaur—so much so that its name has outlasted decades of scientific controversy. Its comeback in 2015 also highlights how paleontology is a living science, where new evidence can overturn long-held conclusions and remind us that even “common knowledge” about extinct animals can change.
Frequently Asked Questions
What are Brontosaurus's powers or ecological role?
Weighing somewhere between 15 and 20 tonnes and stretching up to about 23 metres, Brontosaurus was one of the heaviest land animals of its time. Its towering build and elongated neck let it reach and strip vegetation across a wide band, making it a dominant browser in the Morrison Formation ecosystem.
How does Brontosaurus's story end?
Brontosaurus, like every non-avian dinosaur, was wiped out in the end-Cretaceous mass extinction around 66 million years ago. No direct lineage survived, so the genus left no living descendants in the modern world.
Why is Brontosaurus important to paleontology and pop culture?
For well over a century it was treated as a throwaway synonym of Apatosaurus, so its formal revalidation in 2015 was a genuine milestone in the field. Beyond science, the animal became the visual shorthand for 'long-necked dinosaur' in films, toys, and children's books worldwide.
More in Dinosaurs 1-22
Spotted an error? Know more?
This is a living reference — every entry is fact-audited, and reader corrections feed straight into our audit queue. Suggest an edit · See this site's audit record