Species: sachaliensis NAGAO, 1936
Etymology: In reference to Sachalin Island, Russia where the specimen was found.
Holotype: Institute of Geology and Mineralogy, Hokkaido Imperial University, Regist, No. 6590
Locality: Sachalinskaya Oblast, Sachalin Island, Asian Russia (Old Kawakami Colliery, Toyohara-gun, Island north of Japan).
Horizon: Mh7 or Mh6 of Miho Group, Upper Ammonites Beds.
Age: Early Santonian or Late Coniacian Stage, Lower Senonian Subepoch, Lower
Gulf Epoch, Upper Cretaceous.
Note: Upper Santonian-Lower Campanian Stage, Senonian Subepoch, Gulf Epoch, Late Cretaceous, MATSUKAWA & OBATA, 1994.
Material: Fragmentary skull and fragmentary skeleton.
After Suzuki, Weishampel, & Minoura, 2004,