Jurassic Dinos editorial · Updated · Source-based review
What was Fukuisaurus?
Fukuisaurus was a plant-eating ornithopod from Early Cretaceous Japan. Its name celebrates Fukui Prefecture, where fossils from the Kitadani Formation have revealed several different dinosaurs. Sharing a geographic name does not make those dinosaurs close relatives.
What makes the fossil distinctive?
Its skull and teeth are central to understanding its feeding anatomy. The original description emphasised strong connections between upper-jaw bones, suggesting limits on sideways movement. This is a more specific anatomical question than simply asking whether it could chew.
Where was it found and how was it named?
The first remains were found in 1989, and the genus was named in 2003. Further finds expanded knowledge beyond the original skull material. Museum reconstructions can therefore change as newly prepared bones supply parts that were previously missing.
What can we infer, and what remains uncertain?
Fukuisaurus is compared with iguanodontian dinosaurs such as Iguanodon and Altirhinus. Detailed placement varies between analyses, but the broad plant-eating ornithopod identity is well supported. It should not be confused with Fukuiraptor, a predatory theropod from the same region, or Fukuivenator, another distinct theropod. The common Fukui prefix is a place reference, not a family name.
Are Fukuisaurus and Fukuiraptor the same dinosaur?
No. Fukuisaurus was an ornithopod plant eater; Fukuiraptor was a predatory theropod. Both names refer to Fukui.
How can you check the evidence?
The Paleobiology Database record catalogues Fukuisaurus under Hadrosauroidea. Its linked bibliography identifies this research starting point: Y. Kobayashi and Y. Azuma. 2003. A new iguanodontian (Dinosauria: Ornithopoda) from the Lower Cretaceous Kitadani Formation of Fukui Prefecture, Japan. Journal of Vertebrate Paleontology 23(1):166-175. 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 Fukuisaurus, rather than supplying unsupported size, speed or lifespan figures.
Read the image and keep exploring
A Fukuisaurus skeletal mount presents the ornithopod body and skull for comparison with other plant eaters. A displayed specimen or skeletal mount can include restored parts. Its appearance should be read alongside the original specimen description.
Compare Iguanodon, Altirhinus, Mantellisaurus. Find more names in the F index and explore ornithischian field notes. The glossary explains unfamiliar fossil terms.
Quick answers
- Where have Fukuisaurus fossils been found?
- The discoveries discussed here come from Japan. Modern place names describe discovery locations, not a complete ancient geographic range.
- When did Fukuisaurus 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 Fukuisaurus with related dinosaurs?
- Follow the related field notes below. Comparisons explain shared anatomy; they do not imply that all the animals lived together.
