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Caieiria

Say it: kye-AY-ree-ah

Name means: “named after the Caieira locality where its fossils were found”1

Ate: PlantsLong-necksLate Cretaceous

Caieiria was a huge, long-necked plant-eater that lived in Brazil near the end of the Age of Dinosaurs. It had a strange tail with extra-strong bones that made it different from its cousins.1

Lived

72 to 66 million years ago4

Late Cretaceous

Fossils found in

Minas Gerais, Brazil1 4

Food

Plants2

Length

10 m3

estimate based on relatives and holotype size

When did it live?

Triassic

Jurassic

Cretaceous

252 million years ago20114566, the asteroid

How big was it?

How long was it?

as long as 2 cars parked in a rowas long as 56 bananas end to end

How big was Caieiria compared to YOU?

Just maths in your browser. Nothing is saved or sent anywhere.

cool stuff

Fun facts

Caieiria is known only from a set of ten tail vertebrae, which were originally thought to belong to another dinosaur called Trigonosaurus.1

Its species name 'allocaudata' means 'strange tail', because the tail bones have unusual shapes.1

The fossils were dug up in the 1950s by paleontologist Llewellyn Ivor Price, but the dinosaur was not named until 2022.1

Caieiria lived about 72 to 66 million years ago, during the Maastrichtian stage of the Late Cretaceous.2

It shared its home with other dinosaurs like Baurutitan and the bird-like Ypupiara, as well as crocodile relatives.1

Scientists think Caieiria belongs to a group of titanosaurs called Aeolosaurini, which were common in South America.1

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

?How big was Caieiria?

Nobody knows for sure, because only ten tail vertebrae have been found. Scientists have not estimated its length or weight.1 4

?What did Caieiria eat?

It was a plant-eater, like all sauropods. It probably ate leaves and other plants with its long neck.4

?When did Caieiria live?

It lived about 72 to 66 million years ago, during the Maastrichtian stage of the Late Cretaceous.1

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For dino experts

Scientific name: Caieiria
Named by: Silva Junior et al. 20224
Group: Long-necks
Family / clade: Aeolosaurini4
Classification: Sauropodomorpha > Sauropoda > Titanosauria > Macronaria4
Age of the rocks: 72 to 66 million years (Maastrichtian)4
Rock formations: Serra da Galga4
Countries: Brazil4
Fossil records: 1 in the Paleobiology Database4
Discovery: Caieiria was named in 2022 by Silva Junior and colleagues, based on tail bones collected by Llewellyn Ivor Price in the 1950s from the Caieira quarry in Brazil.1 4
Still debated: Scientists are not sure exactly how big Caieiria was, because only tail bones have been found so far.1

Where the facts come from

Caieiria (en.wikipedia.org)
PBDB Taxon (paleobiodb.org)
Nouveau sauropode : Caieiria – Dinozoïque : Tratayenia et ses compères (dinozoique.fr)
Caieiria 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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