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Arrudatitan

Say it: ah-roo-DAH-tee-tan

Name means: “Arruda's giant”1

Ate: PlantsLong-necksLate Cretaceous

Arrudatitan was a huge, long-necked plant-eater that lived in Brazil during the Late Cretaceous. It was a titanosaur, a group of sauropods that included some of the biggest land animals ever. Even though it was giant, Arrudatitan was more slender and graceful than many of its relatives.1

Lived

84 to 66 million years ago4

Late Cretaceous

Fossils found in

Adamantina Formation, São Paulo state, Brazil4 1

Food

Plants4

Length

15 m1

estimate based on holotype size

Weight

12.3 tonnes3

estimate for 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 2 elephants

as long as 3 cars parked in a rowas long as 83 bananas end to endas heavy as 8 carsas heavy as 2500 watermelons

How big was Arrudatitan compared to YOU?

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

cool stuff

Fun facts

Arrudatitan was first thought to be a species of Aeolosaurus, but scientists later gave it its own genus name in 2021.1 2

The first fossils were found in 1997 by a farmer and his 12-year-old nephew in a field in Cândido Rodrigues, Brazil.1

Its femur (thigh bone) was 1.55 metres (5.1 feet) long, which helps scientists estimate its total length at about 15 metres (49 feet).1

Crocodylomorph and theropod teeth were found near the Arrudatitan skeleton, but there were no bite marks on the bones.1

Arrudatitan lived during the Campanian to Maastrichtian stages of the Late Cretaceous, about 72 to 68 million years ago.1

The name Arrudatitan honors Brazilian paleontologist Antônio Celso de Arruda Campos.1

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

?How big was Arrudatitan?

Arrudatitan grew up to about 15 metres (49 feet) long, based on its fossils. Its thigh bone was 1.55 metres (5.1 feet) long.1

?What did Arrudatitan eat?

It was a plant-eater, or herbivore. As a titanosaur sauropod, it ate plants.4

?When did Arrudatitan live?

Arrudatitan lived during the Late Cretaceous, about 72 to 68 million years ago.1

?Where was Arrudatitan found?

Its fossils were found in the Adamantina Formation of Brazil, in a field near Cândido Rodrigues.1

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For dino experts

Scientific name: Arrudatitan
Named by: Silva Junior et al. 20224
Group: Long-necks
Family / clade: Rinconsauria4
Classification: Sauropodomorpha > Sauropoda > Titanosauria > Macronaria4
Age of the rocks: 84 to 66 million years (Campanian / Maastrichtian)4
Rock formations: Adamantina4
Countries: Brazil4
Fossil records: 1 in the Paleobiology Database4
Discovery: The first fossils were found in 1997 by Ademir Frare and his 12-year-old nephew Luiz Augusto dos Santos Frare in a field in Cândido Rodrigues, Brazil. They told paleontologist Antônio Celso de Arruda Campos, and the bones were collected by staff of the Museu de Paleontologia de Monte Alto. The species was first named Aeolosaurus maximus in 2011, but moved to its own genus Arrudatitan in 2021.1
Still debated: Scientists are still debating exactly how Arrudatitan is related to other titanosaurs, and whether it belongs in the group Rinconsauria or is closer to other South American giants.1 4

Where the facts come from

Arrudatitan (en.wikipedia.org)
Reassessment of Aeolosaurus maximus, a titanosaur dinosaur from the Late Cretaceous of Southeastern Brazil (exa.ai)
Arrudatitan maximus | Dinosaur Database by DinoAnimals.com (dinoanimals.com)
Arrudatitan in The Paleobiology Database (CC BY 4.0): age, places, rock formations, classification.

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