Dinosaurs named after Fukui Prefecture

At present, five new species of dinosaurs have been discovered in Fukui.

Fukuisaurus tetoriensis

This herbivorous dinosaur, belonging to Iguanodontia, was discovered by the dinosaur excavation project in Katsuyama, Fukui Prefecture.

This species was described based on relatively well-preserved skull material in 2003.
Although the tooth shape resembles that of a Mongolian iguanodontian Altirhinus, the absence of lateral movement in the upper jaws in Fukuisaurus is unique.

Koshisaurus katsuyama

In 2008, iguanodontian materials, including a right maxilla, were recovered.
Considering the distribution of these iguanodontian bones in the layer, they probably came from one individual.

The maxilla bearing a unique character assigns this specimen to a new genus and species, Koshisaurus katsuyama.
The histology of the femur implies that this individual was a juvenile and 3 years old or older when it died.

This discovery reveals that the coexistence of at least two iguanodontians in the Cretaceous of Fukui, and its paleoenvironment was rich enough to feed various herbivorous dinosaurs.
Compared to Fukuisaurus, whose body is stout, Koshisaurus is relatively slender.

Fukuiraptor kitadaniensis

The only theropods found in Japan with reconstructed complete skeletons are Fukuiraptor and Fukuivenator which will be introduced later.

Fukuiraptor is a carnivorous dinosaur that is related to Allosaurus, and it was given its scientific name in the year 2000.
It is about 4.2 meters long, rather small compared to their relatives.
Presumably, this dinosaur was in the process of growing and would have become much larger.

Fukuiraptor is characterized by relatively long hands and large hand claws.
These claws are not only large, but also very thin, making it distinctly different from the claws of Allosaurus.

Fukuivenator paradoxus

Fukuivenator is a small theropod belonging to Maniraptoriformes.

Its estimated body weight is about 25 kg.
The specimen, which preserves about 70% of the whole skeleton, was discovered in 2007.
Its teeth, which are conical without serration, suggest an omnivorous diet.

In addition, based on the CT-scanned images of the inner ears, it appears that the spatial sensory perception and auditory ability of Fukuivenator are relatively well-developed among dinosaurs.

Fukuititan nipponensis

Fukuititan was found during the third excavation at Kitadani quarry in the summer of 2007.
The description of Fukuititan was published in June of 2010 and it became the first Japanese sauropod to be named.

Fukuititan differs from other sauropods in having relatively long metacarpal, 48% of the radius and slightly expanded distal end of ischium.
Its phylogenetic position is not clear due to incompleteness of the specimen.

More Dinosaurs...

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Fukui, 911-8601, Japan
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