Koshisaurus

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.[1] "Koshi" means an old Japanese regional name including Fukui prefecture where fossils of the genus were discovered.

Koshisaurus
Temporal range: Early Cretaceous, 128 Ma
↓
Fossil elements
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Order: †Ornithischia
Suborder: †Ornithopoda
Superfamily: †Hadrosauroidea
Genus: †Koshisaurus
Shibata and Azuma, 2015
Type species
Koshisaurus katsuyama
Shibata and Azuma, 2015

Description
Restoration

Koshisaurus was unlike most hadrosauroids due to the fact that it possessed an antorbital fossa, as well as three subsidiary ridges on its maxillary teeth, similar to those of Equijubus. These ridges are also present on the also Asian genera Xuwulong, Jinzhousaurus and Altirhinus; but all three lack antorbital fossae, placing them as more advanced than Koshisaurus.[1]

gollark: Great!
gollark: I go to the building labeled "INSTANT DEATH", open the door slightly, and put the undollar in.
gollark: I give the undollar to the person, as a gift.
gollark: I buy the undollar, then.
gollark: I look at the things.

See also

References
  1. Shibaba, Masateru; Azuma, Yoichi (2015). "New basal hadrosauroid (Dinosauria: Ornithopoda) from the Lower Cretaceous Kitadani Formation, Fukui, central Japan" (PDF). Zootaxa. 3914: 421. doi:10.11646/zootaxa.3914.4.3. PMID 25661952.|


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