Genus: Futabasaurus SATO, HASEGAWA & MANABE, 2006
Etymology:
After the Futaba Group, Santonian, Early Late Cretacous, from which the holotype specimen of the type and only
species and Greek, sauros, "lizard."
Species: suzukii SATO, HASEGAWA & MANABE, 2006
Etymology: In honor of Mr. Tadashi Suzuki who discovered the holotype.
Holotype: NSM PV15025
Locality: A riverside outcrop, 37°10'05"N, 140°58'05"E, on the Ohisa River, Itakizawa, Ohisa Town, Iwaki city, Fukushima Prefecture, Honshu Island, Japan.
Horizon: "D bed", Irimazawa Member, Tamayama Formation, Futaba Group.
Biostratigraphy: Inoceramys amakusensis Zone.
Age: Santonian Stage, Senonian Subepoch, Gulf Epoch, Late Cretaceous.
Material: Fragmentary skull and fragmentary skeleton.
Note: Has tooth marks from the extinct lamniform shark Cretalamna (= Cretolamna) appendiculata SHIMADA, TSUIHIJI, SATO & HASEGAWA, 2010; Tooth tips in the right humerus, posterior cervical vertebra, dorsal vertebra, nerual spine.
Referred material:
KANIE, HASEGAWA, OKAZAKI & TATEMATSU, 1998
Locality: Uppermost stream of east branch of the Shimo-Kinenbetsu River, a tributary of the middle steam of the Obirashibe River, Northwestern Hokkaido Island, Japan.
Horizon:
Biostratigraphy:
Age: Lower Santonian Stage, Senonian Subepoch, Gulf Epoch, Late Cretaceous.
Material:
Obira specimen. 2: 6 vertebrae, 8 ribs, and an ischium.
Note: The jaws of the Vampyromorpha Provampyroteuthis giganteus are in the gut area.