Quaesitosaurus

Say it kwee-siet-oh-sore-us. The name means ‘extraordinary lizard’.

Quaesitosaurus beside a person 1.75 m tall. Ticks mark every metre.Body shape drawn for this site, showing the general build of sauropods

Length: 23 m
Diet: Plant-eater
When: Late Cretaceous86 to 84 million years ago
Fossils found in: Mongolia
Named by: Kurzanov and Bannikov (1983)
Family tree: Dinosauria › Saurischia › Sauropodomorpha › Sauropoda › Diplodocoidea › Nemegtosauridae

Where Quaesitosaurus sits in the age of dinosaurs.Periods from the ICS chart; dinosaur dates from the Natural History Museum

Sauropods. Long-necked, four-legged plant-eaters, the biggest animals ever to walk on land. See all 59

Lived at the same time

Achillobator · same country
Alectrosaurus · same country
Graciliceratops · same country
Microceratus · same country
Tsagantegia · same country
Bagaceratops · same country
Oviraptor · same country
Saurornithoides · same country

Other sauropods

Antarctosaurus Late Cretaceous
Sonidosaurus Late Cretaceous
Argentinosaurus Late Cretaceous
Maxakalisaurus Late Cretaceous
Dreadnoughtus Late Cretaceous
Puertasaurus Late Cretaceous
Aegyptosaurus Late Cretaceous
Paralititan Late Cretaceous

Source: Quaesitosaurus in the Natural History Museum Dino Directory, read 12 November 2026. Sizes are the museum's estimates for a typical adult. "Lived at the same time" lists dinosaurs whose dates overlap, which does not always mean they met.