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Temporal range: Late Cretaceous, Santonian
National Museum of Nature and Science- Futabasaurus.jpg
Reconstructed skeleton
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Superorder: Sauropterygia
Order: Plesiosauria
Family: Elasmosauridae
Genus: Futabasaurus
Sato, Hasegawa & Manabe, 2006
Species: F. suzukii
Binomial name
Futabasaurus suzukii
Sato, Hasegawa & Manabe, 2006

Futabasaurus is a genus of plesiosaur from the Late Cretaceous of Fukushima, Japan. It was described and named in 2006, and was assigned to the family Elasmosauridae. The genus contains one species, F. suzukii.


Cast of fossils of Futabasaurus suzukii exhibited at the National Museum of Nature and Science

The length of Futabasaurus has been estimated at 6.4–9.2 metres (21–30 ft),[1] and it weighed about 3–4 tonnes (3.0–3.9 LT).[citation needed] It can be distinguished from other elasmosaurids by the following characteristics: there is a long distance between the eye sockets and nostrils; the interclavicles and clavicles are fused, and the anterior edge is bent; the humerus is relatively long; and the femora are slim and show prominent muscle scars.[2]

Discovery and naming[edit]


Futabasaurus is the first elasmosaurid found in Japan. The type specimen of Futabasaurus was found in the Irimazawa Member of the Tamayama Formation, in the Futaba Group of Fukushima Prefecture, Japan. The rocks in which it were found date to the Inoceramus amakusensis zone of the early Santonian. The fossils were found by Tadashi Suzuki, then a high school student.[2] Many of the bones of the type specimen show signs of apparent scavenging or predation by sharks.[2]

The genus Futabasaurus was named after the Futaba Group, in which it was discovered; the species name is derived from the family name of its discoverer, Suzuki.[2] The name "Futabasaurus" has also been used for an unrelated theropod dinosaur, also from the Late Cretaceous of Japan. However, this dinosaur was not officially named, and remains a nomen nudum.

See also[edit]


  1. ^ O'Gorman, J.P. (2016). "A Small Body Sized Non-Aristonectine Elasmosaurid (Sauropterygia, Plesiosauria) from the Late Cretaceous of Patagonia with Comments on the Relationships of the Patagonian and Antarctic Elasmosaurids". Ameghiniana. 53 (3): 245–268. doi:10.5710/AMGH.29.11.2015.2928. 
  2. ^ a b c d Sato, Tamaki; Hasegawa, Yoshikazu; Manabe, Makoto (2006). "A new elasmosaurid plesiosaur from the Upper Cretaceous of Fukushima, Japan". Palaeontology. 49 (3): 467–484. doi:10.1111/j.1475-4983.2006.00554.x. 

External links[edit]