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Koshisaurus, new basal hadrosauroid from Lower Cretaceous of Japan



Ben Creisler
bcreisler@gmail.com


A new paper not yet mentioned:

Masateru Shibata and Yoichi Azuma (2015)
New basal hadrosauroid (Dinosauria: Ornithopoda) from the Lower
Cretaceous Kitadani Formation, Fukui, central Japan.
Zootaxa 3914 (4): 421–440.
doi:10.11646/zootaxa.3914.4.3.
http://biotaxa.org/Zootaxa/article/view/zootaxa.3914.4.3

Preview pdf:
http://www.mapress.com/zootaxa/2015/f/z03914p440f.pdf



A new basal hadrosauroid, Koshisaurus katsuyama, from the Lower
Cretaceous Kitadani Formation in Fukui, central Japan, is reported.
The new taxon is distinguished by an autapomorphy and a unique
combination of maxillary, vertebral, pubic and femoral characters. A
phylogenetic analysis indicates that Koshisaurus is positioned as a
basal member of Hadrosauroidea and is more derived than the
contemporaneous Fukuisaurus, which is a non-hadrosauroid
hadrosauriform. The presence of the antorbital fossa on the maxilla
and at least three subsidiary ridges on the labial side of maxillary
tooth crown implies that Koshisaurus was among the most basal
hadrosauroids. This discovery indicates a higher diversity of
hadrosauroids along the eastern margin of the Asian continent in the
Early Cretaceous.