Fukuiraptor‭ (‬Fukui thief‭)

Short Info

Fukuiraptor‭ (‬Fukui thief‭)

Phonetic : Foo-kwee-rap-tor.

Named By : Azuma‭ & ‬Currie‭ ‬-‭ ‬2000

Diet : Carnivore

Size : Estimated 4.2 meters long

Type of Dinosaur : Large Theropod

Type Species : F.‭ ‬kitadaniensis‭ (‬type‭)

Found in : Japan,‭ ‬Honshu Island,‭ ‬Fukui Prefecture -‭ ‬Kitadani Formation

When it Lived : Early Cretaceous, 121-99 million years ago

Fukuiraptor, also known as “thief Fukui”, was a medium-sized megaraptoran dinosaur that lived in Japan during the Early Cretaceous Epoch. Fukuiraptor can be found in the Kitadani Formation, possibly also in the Sebayashi Formation.


Fukuiraptor skeleton★Kumiko★, CC BY-SA 2.0, via Wikimedia Commons


A partial skeleton was found in Kitadani quarry, Fukui prefecture. It is designated FPDM-V97122. This specimen would have been approximately 4.2m long and weighed 175kg. An adult might have been bigger. Many humeri and femurs as well as teeth have been identified in this quarry. The majority of other individuals found in the same area are juveniles, smaller than the holotype (Currie and Azuma 2006), with the smallest cases less than one quarter of the size of the holotype. Fukuiraptor was also referred to by a tooth (NDC–P0001) found in a block made of conglomerate from Sebayashi Formation. Fukuiraptor, despite its short phalanges, was an animal with a light build. Gregory Paul estimated a length of five meters (16 feet) and a weight 300 kg (660 pounds) in 2010. Molina-Perez, Larramendi and others estimated a length 4.3m (14.1ft) and a total weight of 590kg (1,300 lbs).


フクイラプトルの全身骨格化石Titomaurer, CC BY-SA 4.0, via Wikimedia Commons


Fukuiraptor’s distinctive teeth are similar to carcharodontosaurids, which are very compressed and blade-like and have wrinkled enamel. Tyrannosaurids also have oblique blood grooves close to the serrations. The holotype had large, flat manual unguals (hand fingers), which were a factor in its original classification as a Dromaeosaurid (as its hand claws were mistakenly thought to be foot claws).

Source: Wikipedia