Tambatitanis

Tambatitanis (meaning "Tamba giant", after Tamba, the name given to the northwest of Kansai, Japan) is an extinct genus of titanosauriform, possibly titanosaurian, sauropod dinosaur from the Early Cretaceous-aged (early Albian) Ohyamashimo Formation of the Sasayama Group. It is known from a single species, Tambatitanis amicitiae, known from a partial skeleton.

== Discovery and naming == thumb|left|upright|Dentary The holotype specimen of the Tambaitanis, MNHAH D-1029280 was initially discovered in August 2006, by Shigeru Murakami and Kiyoshi Adachi in the reddish mudstone bed of the Ohyamashimo Formation (Lower Formation of the Sasayama Group) on a riverbed of the Sasayama RIver in Kamitaki, Sannan-Cho, Tamba-Sasayama city, of Hyōgo Prefecture, Japan. It took five field seasons, from 2006 to 2010 to excavate a fossil because access to the skeleton was only available during the winter when the water level of the river becomes lowest. It was originally called 'Tamba-Ryu' before the publication in 2014. The specimen is somewhat semi-articulated and includes teeth, a braincase, a dentary, an atlas, a fragmental cervical vertebra, dorsal ribs, two fragmental dorsal vertebrae, a pubis, an ilium, sacral spines, presumable first sacral ribs, 22 caudal vertebrae, and 17 chevrons.