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Equijubus

Say it: eh-KWEE-joo-bus

Name means: “horse mane”1

Ate: PlantsBeaked plant-eatersEarly Cretaceous

Equijubus was an early duck-billed dinosaur that lived in what is now China. It had a long snout and ate plants, maybe even grass. This dinosaur is one of the oldest known hadrosauroids, the group that includes the famous duck-billed dinosaurs.1 2

Lived

113 to 110 million years ago3

Early Cretaceous

Fossils found in

Mazong Shan area, Gansu Province, China1 3

Food

Plants1

Length

7 m1

estimate

Weight

2.5 tonnes1

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 1.5 cars

as long as 7 dogs nose to tailas long as 39 bananas end to endas heavy as 83 big dogsas heavy as 500 watermelons

How big was Equijubus compared to YOU?

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cool stuff

Fun facts

Equijubus is one of the earliest known duck-billed dinosaurs, or hadrosauroids.1 2

Its name means 'horse mane' in Latin, because it was found near Mazong Mountain, which means 'horse mane mountain' in Chinese.1

The only known fossil of Equijubus includes a complete skull and parts of the backbone and hips.1

Grass microfossils found on an Equijubus specimen are among the oldest known grass fossils, and may be the oldest evidence of a dinosaur eating grass.1

Equijubus lived about 113 to 110 million years ago, during the Early Cretaceous period.3

Unlike many later duck-billed dinosaurs, Equijubus lacked a bony ridge over its eyes called a palpebral bone.1

AI-made picture of Equijubus — An AI-made picture of how Equijubus 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 Equijubus

?How big was Equijubus?

Equijubus was about 7 metres (23 feet) long and weighed around 2.5 tonnes (about 5,500 pounds).1

?What did Equijubus eat?

Equijubus was an herbivore that ate plants. Grass microfossils found on a specimen suggest it may have eaten grass, making it one of the earliest known grass-eating dinosaurs.1

?When did Equijubus live?

Equijubus lived during the Early Cretaceous period, about 113 to 110 million years ago.1

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For dino experts

Scientific name: Equijubus
Named by: You et al. 20033
Group: Beaked plant-eaters
Family / clade: Hadrosauroidea3
Classification: Ornithischia > Ornithopoda > Iguanodontia3
Age of the rocks: 113 to 110 million years (Albian)3
Rock formations: Zhonggou3
Countries: China3
Fossil records: 1 in the Paleobiology Database3
Discovery: Equijubus was named in 2003 by You Hailu and colleagues. The only fossil was found in the summer of 2000 by a Chinese-American expedition in the Gobi Desert of northwest China.1 2
Still debated: Scientists are not sure if Equijubus was a true hadrosauroid or a more primitive iguanodont. Some studies place it as the earliest hadrosauroid, but others think it might be outside that group.1

Where the facts come from

Equijubus (en.wikipedia.org)
The earliest-known duck-billed dinosaur from deposits of ... (people.ohio.edu)
Equijubus in The Paleobiology Database (CC BY 4.0): age, places, rock formations, classification.

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