Named By: Masateru Shibata & Yoichi Azuma - 2015.
Classification: Chordata, Reptilia, Dinosauria, Ornithischia, Ornithopoda, Hadrosauroidea.
Species: K. katsuyama (type).
Size: Uncertain due to lack of fossils with known elements probably representing juvenile individuals.
Known locations: Japan, Fukui - Kitadani Formation.
Time period: Aptian of the Cretaceous.
Fossil representation: Holotype is a partial maxilla and teeth, with additional post cranial remains
is a genus of primitive hadrosauroid dinosaur from the early Cretaceous
of Japan. At the time of writing all known remains of Koshisaurus
partial as well as probably representing juvenile or sub adult
individuals, both of which are factors that make it difficult to
ascertain how big this dinosaur could grow. Though not yet
exceptionally well known, Koshisaurus has been
considered as distinct
another hadrosauroid from the same Formation that
Koshisaurus is known from. Possible predators of Koshisaurus
include theropod dinosaurs such as Fukuiraptor.
Koshisaurus means ‘koshi lizard’. Koshi is the old name for Fukui Prefecture, which is where the Koshisaurus holotype fossils were discovered. The species name katsuyama means ‘from Katsuyama’.
- New basaltic hadrosauroid (Dinosauria: ornithopoda) from the Lower Cretaceous Kitadani Formation, Fukui, central Japan. - Zootaxa 3914 (4): 421-440. - Masateru Shibata & Yoichi Azuma - 2015.