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Invictarx

Say it: in-VIK-tarks

Name means: “unconquerable fortress”1

Ate: PlantsArmoured dinosLate Cretaceous

Invictarx was a slow, four-legged dinosaur covered in bony armour like a tank. It lived in what is now New Mexico, USA, about 78 million years ago. Its name means 'unconquerable fortress' because it was so well protected.1 2

Lived

84 to 72 million years ago5

Late Cretaceous

Fossils found in

San Juan County, New Mexico, USA2

Food

Plants5

Length

up to 3.5 m3

estimate, largest known specimen

Weight

up to 300 kg3

estimate, 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 10 big dogs

as long as 4 dogs nose to tailas long as 19 bananas end to endas heavy as 60 watermelons

How big was Invictarx compared to YOU?

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

cool stuff

Fun facts

Invictarx is known from only three partial skeletons, including bony plates called osteoderms that covered its back.1 2

Its armour had a smooth surface with many tiny pits, unlike the rough, grooved armour of some other nodosaurs.2

Some of its shoulder and back plates had a low, rounded ridge with a deep groove running along the top.2

Invictarx probably had a fused shield of polygonal (many-sided) bones over its hips, like a built-in suit of armour.2

It lived alongside other dinosaurs in a coastal plain environment, about 78.5 million years ago.1 2

The first Invictarx fossil was found in May 2011 by Daniel Williamson, and two more skeletons were discovered later.1

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

?How big was Invictarx?

Scientists do not know its exact size because only partial skeletons have been found, but it was a medium-sized nodosaurid, probably similar to other armored dinosaurs like Sauropelta.1 2

?What did Invictarx eat?

Invictarx was a plant-eating dinosaur. It likely ate ferns, cycads, and other low-growing plants that grew in its coastal plain environment.1 4

?When did Invictarx live?

Invictarx lived about 78.5 million years ago, during the Late Cretaceous Period.1 5

?Was Invictarx a dinosaur?

Yes, Invictarx was a dinosaur. It was a nodosaurid ankylosaur, a type of armored, plant-eating dinosaur.1 2

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For dino experts

Scientific name: Invictarx
Named by: McDonald and Wolfe 20185
Group: Armoured dinos
Family / clade: Nodosauridae5
Classification: Ornithischia > Ankylosauria > Nodosauridae > Thyreophora5
Age of the rocks: 84 to 72 million years (Campanian)5
Rock formations: Menefee5
Countries: USA5
Fossil records: 1 in the Paleobiology Database5
Discovery: Invictarx was named in 2018 by Andrew T. McDonald and Douglas G. Wolfe. The first skeleton was found in 2011 by Daniel Williamson, and two more were discovered in 2011 and 2015.1 2
Still debated: Scientists are not sure exactly how big Invictarx was, because only partial skeletons have been found.1 2

Where the facts come from

Invictarx (en.wikipedia.org)
A new nodosaurid ankylosaur (Dinosauria: Thyreophora) from the Upper Cretaceous Menefee Formation of New Mexico (pmc.ncbi.nlm.nih.gov)
Invictarx zephyri | Dinosaur Database by DinoAnimals.com (dinoanimals.com)
Fossil Friday - Invictarx zephyri — Western Science Center (westernsciencecenter.org)
Invictarx 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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