Pareisactus

Say it: PAIR-ay-SAK-tus

Name means: “intruder”1

Ate: PlantsBeaked plant-eatersLate Cretaceous

Pareisactus was a small, plant-eating dinosaur that lived in what is now Spain. It is known from just one shoulder bone, but that bone tells us a lot about this mysterious creature.1 2

Lived

72 to 66 million years ago4

Late Cretaceous

Fossils found in

Spain, specifically the Conques Formation in the south-central Pyrenees of northeastern Spain.2 1

Food

Plants4

Length

3.6 m3

largest known specimen

Weight

130 kg3

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 4 big dogs

as long as 4 dogs nose to tailas long as 20 bananas end to endas heavy as 26 watermelons

How big was Pareisactus compared to YOU?

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cool stuff

Fun facts

Pareisactus is known from only a single shoulder blade, called a scapula.1 2

Its name means 'intruder' because it was found among hundreds of bones from a different dinosaur group, the hadrosaurids.1

Pareisactus belonged to a group called Rhabdodontidae, which were plant-eating dinosaurs that lived in Europe.2 1

It was the seventh species of rhabdodontid found in Europe, and the third from the eastern Tremp Syncline in the Pyrenees.2

The shoulder blade of Pareisactus has a deep and thick roof over a very deep deltoid fossa, which is a muscle attachment area.2

AI-made picture of Pareisactus — An AI-made picture of how Pareisactus 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: Pareisactus
Named by: Párraga and Prieto-Márquez 20194
Group: Beaked plant-eaters
Family / clade: Rhabdodontoidea4
Classification: Ornithischia > Ornithopoda > Iguanodontia4
Age of the rocks: 72 to 66 million years (Maastrichtian)4
Rock formations: Conques4
Countries: Spain4
Fossil records: 1 in the Paleobiology Database4
Discovery: Pareisactus was named by Javier Párraga and Albert Prieto-Márquez in 2019, based on a single scapula found in the Conques Formation in Spain.2 1
Still debated: Scientists are still debating exactly how Pareisactus is related to other rhabdodontids, since it is known from so little material.2

Where the facts come from

Pareisactus (en.wikipedia.org)
Pareisactus evrostos , a new basal iguanodontian (Dinosauria: Ornithopoda) from the Upper Cretaceous of southwestern Europe (mapress.com)
Pareisactus evrostos | Dinosaur Database by DinoAnimals.com (dinoanimals.com)
Pareisactus in The Paleobiology Database (CC BY 4.0): age, places, rock formations, classification.

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