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Eucoelophysis

Say it: YOO-koh-LOF-ih-sis
Name means: “true hollow form”1
Ate: PlantsBeaked plant-eatersLate Triassic

Eucoelophysis was a small, plant-eating dinosaur that lived about 212 million years ago in what is now New Mexico. It had a beak and walked on two legs, looking a bit like a long-legged lizard. Scientists once thought it was a meat-eater, but now they know it munched on plants.12

Lived
227 to 201 million years ago2
Late Triassic
Fossils found in
New Mexico, USA (Petrified Forest Formation, Chinle Group)12
Length
2 to 3 m (6.6 to 9.8 ft)1
estimate based on related silesaurids
Height
0.94 m (3.1 ft)
estimate
Top speed
about 46 km/h (29 mph)
Running, estimate
What did Eucoelophysis eat?
It was a plant-eater. It had a beak and munched on plants, unlike the meat-eating dinosaurs it was once mistaken for.

When did it live?

Triassic
Jurassic
Cretaceous
252 million years ago20114566, the asteroid

How big was it?

How long was it?

Eucoelophysis about 3 m long (9.8 ft)A bicycle about 1.8 m (5.9 ft)A car about 4.5 m (15 ft)An elephant, the biggest land animal today about 6.5 m (21 ft)

How tall was it?

A house catabout 0.3 m (1 ft)A dogabout 0.5 m (1.6 ft)Eucoelophysisabout 0.94 m tall (3.1 ft)A horseabout 1.6 m (5.2 ft)

estimate

as long as 3 dogs nose to tailas long as 17 bananas end to endcould run 100 metres in 7.8 seconds (the fastest human needs 9.6)

How big was Eucoelophysis compared to YOU?

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How fast was it?

cool stuff

Fun facts

1

Eucoelophysis was named in 1999 by paleontologists Robert Sullivan and Spencer Lucas.12

2

Its fossils were first found in the 1880s by David Baldwin, but were mixed up with another dinosaur called Coelophysis.1

3

For a long time, scientists thought Eucoelophysis was a meat-eating dinosaur, but in 2007 a study showed it was actually a plant-eater related to Silesaurus.1

4

Eucoelophysis lived during the Late Triassic period, about 212 million years ago.1

5

The name Eucoelophysis means 'true hollow form' because it was thought to be the real Coelophysis at first.1

6

Only a few bones of Eucoelophysis have been found, including parts of the hip and hind legs.1

7

Eucoelophysis is now placed in a group called Silesauridae, which are close relatives of dinosaurs.1

AI-madeAI-made picture of Eucoelophysis
An AI-made picture of how Eucoelophysis 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.
you asked

Most asked questions about Eucoelophysis

?Was Eucoelophysis a dinosaur?

No, it is not a dinosaur. Scientists now place it in a group called Silesauridae, which are close relatives of dinosaurs but not true dinosaurs.1

?How big was Eucoelophysis?

The exact size is not known from the few bones found, but it was a small animal, probably about the size of a modern turkey or a small dog.1

?What did Eucoelophysis eat?

It was a plant-eater. It had a beak and munched on plants, unlike the meat-eating dinosaurs it was once mistaken for.1

?When did Eucoelophysis live?

It lived during the Late Triassic period, about 212 million years ago, in what is now New Mexico.1

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Myth buster

Myth: Eucoelophysis was a meat-eating dinosaur like Coelophysis.

Truth: Eucoelophysis was actually a plant-eater, as shown by its beak and hip bones.12

For dino experts

Scientific name
Eucoelophysis
Named by
Sullivan and Lucas 19992
Group
Beaked plant-eaters
Family / clade
Silesauridae2
Classification
Ornithischia2
Age of the rocks
227 to 201 million years (Norian / Rhaetian)2
Rock formations
Chinle2
Countries
USA2
Fossil records
2 in the Paleobiology Database2
Discovery
Eucoelophysis was named in 1999 by Robert Sullivan and Spencer Lucas based on a skeleton found in New Mexico. The species name baldwini honors David Baldwin, who collected the first fossils in the 1880s.12
Still debated
Scientists are still debating whether some fossils from the Snyder Quarry and Hayden Quarry belong to Eucoelophysis or to other animals.1

Where the facts come from

  1. Eucoelophysis (en.wikipedia.org)
  2. Eucoelophysis in The Paleobiology Database (CC BY 4.0): age, places, rock formations, classification.

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More from the same group: Beaked plant-eaters

Also from the same time: Late Triassic

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