Dino card No. 0599 of 2,027

Eomamenchisaurus

Say it: ee-oh-MAM-en-kih-SORE-us

Name means: “dawn Mamenchisaurus”1

Ate: PlantsLong-necksMiddle Jurassic

Eomamenchisaurus was an early long-necked dinosaur that lived in what is now China. It was a sauropod, a giant plant-eater that walked on four legs and had a very long neck.1

Lived

175 to 162 million years ago5

Middle Jurassic

Fossils found in

Yuanmou, Yunnan Province, China1 3

Food

Plants2

Length

up to 15.5 m4

largest known specimen

Weight

up to 4.5 tonnes4

largest known specimen

When did it live?

Triassic

Jurassic

Cretaceous

252 million years ago20114566, the asteroid

How big was it?

How long was it?

How heavy was it?

as heavy as 3 cars

as long as 3 cars parked in a rowas long as 86 bananas end to endabout as heavy as an elephantas heavy as 900 watermelons

How big was Eomamenchisaurus compared to YOU?

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cool stuff

Fun facts

Eomamenchisaurus means 'dawn Mamenchisaurus' because it is an early relative of the better-known Mamenchisaurus.1

Its thigh bone (femur) is 1.1 metres (3.6 feet) long, similar to the femur of Mamenchisaurus youngi, which was about 16 metres (52 feet) long.1

The tibia (shin bone) is only about 64% as long as the femur, a primitive feature compared to later sauropods.1

Some of its back vertebrae are fused together, a trait shared with other mamenchisaurid dinosaurs.1

The fourth trochanter (a ridge for muscle attachment on the femur) is on the inner side of the bone, like in early sauropods, not in the middle like in Mamenchisaurus.1

Eomamenchisaurus lived during the Middle Jurassic, about 174 to 161 million years ago.2

AI-made picture of Eomamenchisaurus — An AI-made picture of how Eomamenchisaurus might have looked, made by a computer from what scientists know. It is a guess: the real animal may have looked different, and nobody knows its true colours.

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For dino experts

Scientific name: Eomamenchisaurus
Named by: Lü et al. 20085
Group: Long-necks
Family / clade: Mamenchisauridae5
Classification: Sauropodomorpha > Sauropoda5
Age of the rocks: 175 to 162 million years (Aalenian / Callovian)5
Rock formations: Zhanghe5
Countries: China5
Fossil records: 1 in the Paleobiology Database5
Discovery: Eomamenchisaurus was named in 2008 by Lü Junchang and colleagues based on a partial skeleton found in Jiangyi Township, Yuanmou County, Yunnan, China.1
Still debated: Scientists are not sure if Eomamenchisaurus is actually different from another mamenchisaurid called Yuanmousaurus, which was found in the same rock formation.1

Where the facts come from

Eomamenchisaurus (en.wikipedia.org)
PBDB Taxon (paleobiodb.org)
A New Mamenchisaurid Dinosaur from the Middle Jurassic of Yuanmou, Yunnan Province, China (onlinelibrary.wiley.com)
Eomamenchisaurus yuanmouensis | Dinosaur Database by DinoAnimals.com (dinoanimals.com)
Eomamenchisaurus in The Paleobiology Database (CC BY 4.0): age, places, rock formations, classification.

Every fact on this page has a number that points to its source. If we got something wrong, sorry, we are dino fans, not a science journal. Tell us at [email protected] and we will fix it.

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