Jurassic Dinos editorial · Updated · Source-based review
What was Arenysaurus?
Arenysaurus was a plant-eating duck-billed dinosaur from near the end of the Cretaceous. Its remains were found around Arén in the Spanish Pyrenees. It is a lambeosaurine, part of the hadrosaur branch associated with hollow cranial crests.
What makes the fossil distinctive?
The known material includes part of the skull and skeleton. Skull details, including the region around the brain, allow comparisons with other hadrosaurs. Missing portions limit how precisely its complete face and crest can be restored. An artist must distinguish preserved anatomy from features supplied by comparison.
Where was it found and how was it named?
Arenysaurus was named in 2009 from fossils in the Tremp Formation. Local knowledge and the participation of people around Arén helped bring the discoveries to scientific attention. The name keeps that connection between a fossil and its community visible.
What can we infer, and what remains uncertain?
Its rocks belong to the Maastrichtian, the final stage of the Cretaceous. That makes Arenysaurus useful in studying European dinosaurs close to the end-Cretaceous extinction. It does not mean the individual fossil was killed by the asteroid impact. Dating a rock layer gives a geological interval, not automatically the cause or exact moment of an animal’s death.
Was this individual killed by the extinction asteroid?
The fossil’s late Cretaceous age alone cannot establish that. Evidence of the individual’s death and its precise layer would be needed.
How can you check the evidence?
The Paleobiology Database record catalogues Arenysaurus under Arenysaurini. Its linked bibliography identifies this research starting point: X. Pereda-Suberbiola, J. I. Canudo, and P. Cruzado-Caballero, J. L. Barco, N. López-Martínez, O. Oms, J. I. Ruiz-Omeñaca. 2009. The last hadrosaurid dinosaurs of Europe: a new lambeosaurine from the uppermost Cretaceous of Aren (Huesca, Spain). Comptes Rendus Palevol 8:559-572. Open the bibliographic record. A catalogue entry establishes the source trail; it does not independently verify every later illustration or behavioural claim.
Use the dated genus overview to follow the references behind the discovery and anatomy discussed above. When sources disagree, compare which specimen and rock layer each author studied. A reconstructed whole animal can combine original bones with comparisons to relatives; those two kinds of evidence should not be confused. The account above explains the particular limits that matter for Arenysaurus, rather than supplying unsupported size, speed or lifespan figures.
Read the image and keep exploring
Labelled views of Arenysaurus skull material show anatomical surfaces and scale bars rather than a speculative complete crest. A displayed specimen or skeletal mount can include restored parts. Its appearance should be read alongside the original specimen description.
Compare Aralosaurus, Canardia, Parasaurolophus. Find more names in the A index and explore ornithischian field notes. The glossary explains unfamiliar fossil terms.
Quick answers
- Where have Arenysaurus fossils been found?
- The discoveries discussed here come from Spain. Modern place names describe discovery locations, not a complete ancient geographic range.
- When did Arenysaurus live?
- It is placed in the Cretaceous period. See the discovery discussion for qualifications about the particular rock layers and dating.
- Where can I compare Arenysaurus with related dinosaurs?
- Follow the related field notes below. Comparisons explain shared anatomy; they do not imply that all the animals lived together.
