What does apatosaurus mean?
Apatosaurus is a genus of enormous plant-eating dinosaur that lived during the Late Jurassic period, roughly 150 million years ago. Belonging to the sauropod group, it was distinguished by an extremely long neck and tail, a bulky quadrupedal body, and a comparatively tiny head, reaching lengths that could exceed twenty metres. Like other sauropods, it moved on four sturdy legs and browsed high and low vegetation to sustain its immense bulk. Fossils of Apatosaurus were first described from North America in the late nineteenth century, and the animal became famous worldwide under the rival name Brontosaurus, which was later judged to be the same genus; recent research has reopened debate about whether Brontosaurus deserves separate status. Today, Apatosaurus remains one of the most iconic and recognizable dinosaurs, frequently displayed as mounted skeletons in natural history museums and featured prominently in books, films, and children's media about prehistoric life.
nounA very large herbivorous dinosaur of the Late Jurassic period, belonging to the sauropod group, characterized by a long neck and tail, a massive body, and a small head. It is one of the best-known sauropods and was formerly widely known by the name Brontosaurus.
- A genus of large herbivorous sauropod dinosaur from the Late Jurassic period, known for its long neck and tail and massive body.
"The museum's towering skeleton of an apatosaurus gave visitors a vivid sense of just how enormous some Jurassic dinosaurs were."
"An adult Apatosaurus could reach lengths of more than twenty metres, feeding on vegetation with its long neck."
"Paleontologists studied the Apatosaurus vertebrae to learn how these giants supported their enormous weight."
As a genus name, the plural is typically expressed simply as 'Apatosaurus' used attributively (e.g., 'several Apatosaurus specimens'); anglicized plurals such as 'apatosauruses' appear informally.
"Several Apatosaurus fossils were unearthed at the dig site."
For over a century, one of the world's most famous dinosaurs — the 'Brontosaurus' — was officially declared not to exist, its fossils reassigned to the genus Apatosaurus after scientists realized the two names described the same creature.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of apatosaurus
The name Apatosaurus derives from Greek roots: 'apate' meaning 'deception' or 'trick', combined with 'sauros' meaning 'lizard'. It was coined in the late nineteenth century by American paleontologist Othniel Charles Marsh, who chose the name because certain bones of the fossil resembled those of another reptile, suggesting a deceptive similarity. The word shares its '-saurus' element with many other dinosaur names derived from Greek.
How apatosaurus is actually used
Used mainly in scientific, educational, and popular-dinosaur contexts; capitalized as a genus name in formal taxonomy, but often written lowercase in general usage. The name carries strong associations with classic depictions of giant long-necked dinosaurs.
Easily confused with apatosaurus
Brontosaurus was long considered a junior synonym of Apatosaurus (the same animal under a different name), though some modern studies have argued for restoring Brontosaurus as a separate genus; the two names refer to closely related giant sauropod dinosaurs.