Dino card No. 0046 of 2,027

Ahshislesaurus

Say it: ah-SHISH-leh-SORE-us

Name means: “Ah-shi-sle-pah lizard”1

Ate: PlantsDuck-billsLate Cretaceous

Ahshislesaurus was a duck-billed dinosaur that lived in what is now New Mexico, USA, about 75 million years ago. It had a flat head and a wide, toothless beak for munching on plants. This dinosaur was a big, gentle herbivore that walked on four legs but could also run on two.2 4

Lived

84 to 72 million years ago4

Late Cretaceous

Fossils found in

Ah-shi-sle-pah Wilderness, San Juan County, New Mexico, USA1 4

Food

Plants2 4

Length

10.668 to 11 m2 3

Weight

8.16466 tonnes3

estimate

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 5 cars

as long as 2.5 cars parked in a rowas long as 61 bananas end to endas heavy as 1.5 elephantsas heavy as 1600 watermelons

How big was Ahshislesaurus compared to YOU?

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cool stuff

Fun facts

Ahshislesaurus had 45 tooth positions in its jaw, more than its relative Kritosaurus which had 42.2

Its name comes from the Ah-shi-sle-pah Wilderness in New Mexico, where its fossils were found.1

This dinosaur lived about 75 million years ago during the Campanian age of the Late Cretaceous.2 4

Ahshislesaurus was a flat-headed hadrosaur, meaning it did not have a bony crest on its skull.1

Its teeth were arranged into tight, interlocking dental batteries that were constantly replaced throughout its life.2

The only known skull of Ahshislesaurus was originally thought to belong to a different dinosaur called Kritosaurus navajovius.1

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

?What did Ahshislesaurus eat?

Ahshislesaurus was a herbivore, eating plants with its wide, toothless beak and complex dental batteries.2

?Did Ahshislesaurus have a crest?

No, Ahshislesaurus did not have a tube-like crest like Parasaurolophus, but it had a small bump over its snout.2

?When did Ahshislesaurus live?

Ahshislesaurus lived about 75 million years ago, during the Campanian age of the Late Cretaceous.2 3

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For dino experts

Scientific name: Ahshislesaurus
Named by: Dalman et al. 20254
Group: Duck-bills
Family / clade: Hadrosauridae4
Classification: Ornithischia > Ornithopoda > Iguanodontia > Hadrosauridae4
Age of the rocks: 84 to 72 million years (Campanian)4
Rock formations: Kirtland4
Countries: USA4
Fossil records: 3 in the Paleobiology Database4
Discovery: Ahshislesaurus was named in 2025 by a team of paleontologists led by S. G. Dalman. The holotype skull was found in the Ah-shi-sle-pah Wilderness in New Mexico.4 1
Still debated: Scientists are still debating whether Ahshislesaurus and another flat-headed hadrosaur, Naashoibitosaurus, form a new group of duck-billed dinosaurs.1

Where the facts come from

A NEW SAUROLOPHINE HADROSAURID (ORNITHISCHIA: HADROSAURIDAE) FROM THE UPPER CRETACEOUS (CAMPANIAN) HUNTER WASH MEMBER, KIRTLAND FORMATION, SAN JUAN BASIN, NEW MEXICO (krqe.com)
Ahshislesaurus (en.wikipedia.org)
Enormous new duck-billed dinosaur species identified in northwest New Mexico :: Department of Cultural Affairs Media Center :: Press Releases (media.newmexicoculture.org)
Ahshislesaurus in The Paleobiology Database (CC BY 4.0): age, places, rock formations, classification.

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