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meaning: "Koshi lizard"
Named By: Masateru Shibata & Yoichi Azuma in 2015
Time Period: Early Cretaceous, 128 Ma
Location: Japan, Fukui - Kitadani Formation
Size: Uncertain due to lack of fossils with known elements probably representing juvenile individuals
Diet: Herbivore
Fossil(s): Holotype is a partial maxilla and teeth, with additional post cranial remains
Classification: | Chordata | Reptilia | Dinosauria | Ornithischia | Ornithopoda | Hadrosauroidea |

Koshisaurus is a monospecific genus of basal hadrosauroid from the Kitadani Formation in Japan. The discovery of the genus suggests that hadrosauroids had higher diversity along the eastern margin of Asia in the Early Cretaceous. "Koshi" means an old Japanese regional name including Fukui prefecture where fossils of the genus were discovered.

Read more about Koshisaurus at Wikipedia
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