The newly named dinosaur, a type of nodosaurid, is now one of just three species of its kind found in Asia to date. The scarcity of nodosaurids in Asia, and the fact that the newly described beast is similar anatomically to those from North America, hint that its species likely arose from a migration from North America to Asia via the Bering Land Bridge, an ancient strip of land that connected present-day Alaska and Russia, researchers reported in the February 2027 issue of the journal Cretaceous Research.
Nodosaurids are armored dinosaurs covered in bony plates. They are closely related to ankylosaurids, but they lack the heavy tail clubs ankylosaurids used to protect themselves from predators. Nodosaurid fossils have primarily been found in North America and Europe, though a few have been uncovered in Asia.
Ancestors of Nipponopelta yezoensis likely migrated along the North American coastline and across the Bering Land Bridge to present-day Japan, which was connected to mainland Asia at the time, a new study suggests. (Image credit: Masato Hattori)
CT scanning enables researchers to make digital 3D models of specimens, and "lets you just get more information than you'd be able to have otherwise, because you can look inside without breaking [the fossil]," Arbour told Live Science.
N. yezoensis is closely related to North American nodosaurids, the team found. The dino's ancestors may have migrated from North America to Asia via a land bridge in what is now the Bering Strait 100 million to 110 million years ago.
CT scans show where the recovered Nipponopelta yezoensis fossils would have been inside the animal's head. (Image credit: Oyabu et al 2026)Coastal dinosaur?
Several other nodosaurid fossils have been found in similar marine deposits, suggesting the creatures lived along coastlines. That may have helped them migrate along the Bering Land Bridge and disperse by following the coast, study co-author Darla Zelenitsky, a dinosaur paleobiologist at the University of Calgary, told Live Science.
Nipponopelta yezoensis would have walked on four legs, eaten plants, and lived in a coastal region, researchers suggest. (Image credit: Genya Masukawa)"The nature of the fossil record is that it's patchy and incomplete," Mallon said. "It's very hard to tell a comprehensive story when you've only got a few pages out of a phone book's worth of time."
Related StoriesIt's also not clear from the fossil record why so few nodosaurid species have been found in Asia compared with North America, Zelenitsky said. While several ankylosaurid species have been found further inland in Asia, few nodosaurid fossils have been unearthed on the continent.
In future studies, "I hope that we find more of this animal," Mallon said. "It incites us to keep digging so that we can learn more about this animal and test some of our ideas about just what it is."
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