Species: undulates HIRAYAMA & CHITOKU, 1996
Etymology:

Holotype: HMG 5

Locality: Shirafunenosawa River, Inasato, Hobetsu, Hokkaido Island, Japan.

Horizon: Osoushinai Formation.

Biostratigraphy:

Age: Early Campanian Stage, Upper Senonian Subepoch, Upper Gulf Epoch, Late Cretaceous.

Material: Supraoccipital, 4th cervical to posterior extremity of caudal vertebrae, and appendicular skeleton including partial manus and pes, carapace lacking anterior portion and nearly complete plastron.

Referred material:

Locality: Locality 8, Ohmagarinosawa River, Hiraoka, Hobetsu, Hokkaido Island, Japan.

Horizon: Osoushinai Formation.

Biostratigraphy:

Age: Early Campanian Stage, Upper Senonian Subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

HMG 6: Partial carapace and appendicular skeleton.

 

Locality: Locality 7, Pankerusanosawa River, Hiraoka, Hobetsu, Hokkaido Island, Japan.

Horizon: Osoushinai Formation.

Biostratigraphy:

Age: Early Campanian Stage, Upper Senonian Subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

HMG 8: Thoracic and sacral vertebrae, hind limbs, posterior portion of shell.

HMG 363: Prootic, caudal vertebrae, hind limbs and peripherals.

HMG 365: Pectoral girdles and anterior portion of plaston.

SATO, KONISHI, HIRAYAMA, & CALDWELL, 2012

HMG 9, 1129, 1220: Partial skeletons and shells.

 

Locality: Locality 7, Pankerusanosawa River, Tomiuchi, Hobetsu, Hokkaido Island, Japan.

Horizon: Osoushinai Formation.

Biostratigraphy:

Age: Early Campanian Stage, Upper Senonian Subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

HMG 369: coracoid and anterior portion of carapace.

HMG 368: Sixth perpherial.

 

Locality: Locality 4, Hobetsu River, Mobetsu, Hobetsu, Hokkaido Island, Japan.

Horizon: Osoushinai Formation.

Biostratigraphy:

Age: Early Campanian Stage, Upper Senonian Subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

HMG 1053: Pelvic girdle and partial carapace.

SATO, KONISHI, HIRAYAMA, & CALDWELL, 2012

HMG 7, 1054: Partial skeletons and shells.

Locality: Locality 5, Mobetsu, Hobetsu, Hokkaido Island, Japan.

Horizon: Osoushinai Formation.

Biostratigraphy:

Age: Early Campanian Stage, Upper Senonian Subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

HMG 362: Pubis and eighth pleural.

 

Locality: Locality 3, Hobetsu River, Kiusu, Hobetsu, Hokkaido Island, Japan.

Horizon: Osoushinai Formation.

Biostratigraphy:

Age: Early Campanian Stage, Upper Senonian Subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

HMG 342: Cervical and first thoracic vertebrae, scapula, anterior portion of carapace and partial plastron.

 

Locality: Locality 1, Sosohisawa, Inasato, Hobetsu, Hokkaido Island, Japan.

Horizon: Osoushinai Formation.

Biostratigraphy:

Age: Early Campanian Stage, Upper Senonian Subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

HMG 1062: Dentary.

HMG 1063: 1st and 2nd sacral and caudal vertebrae, pelvic girdle and right femur.

HMG 1064: Left pubis, peripherals and xiphiplastra.

 

HIRAYAMA, FUJII & TAKAHASHI, 2006

Locality: Shionoe, Takamatsu City, Kagawa Prefecture, Shikoku Island, Japan.

Horizon: Izumi Group.

Biostratigraphy:

Age: Early Late Campanian Stage, Upper Senonian Subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

TKPM-GFV126: Left hypoplastron, right 4th cosalt, right 5 costal, right 3rd peripheral, right 5th preipheral, right 6th peripheral, andleft 6th peripheral.

 

HIRAYAMA & HIKIDA, 1998

Locality: Nakagawa-cho, Hokkaido Island, Japan.

Horizon: Yasukawa Formation.

Biostratigraphy:

Age: Early Campanian Stage, Upper Senonian Subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

NMV-3: Fragmentary humeri.

 

HIRAYAMA & SILS, 2007

Locality: Tomamae-cho, Hokkaido Prefecture, Hokkaido Island, Japan.

Horizon: Yezo Group.

Biostratigraphy:

Age: Santonian Stage, Lower Senonian Subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

HMH 151807: Skull.

 

SATO, KONISHI, HIRAYAMA, & CALDWELL, 2012

Locality: Shirafunenosawa Creek, Hobetsu Distict of Mukawa Town, Hobetsu, Hokkaido Island, Japan.

Horizon:

Biostratigraphy:

Age: Early Campanian Stage, Upper Senonian Subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

HMG 1230: Partial carapace.

 

Locality: Hobetsu River, Hobetsu district of Mukawa Town, Hobetsu, Hokkaido Island, Japan.

Horizon: Hakobuchi Group..

Biostratigraphy:

Age: Early Campanian Stage, Upper Senonian Subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

HMG 1078: Shell fragments.

 

Locality: A branch of Makkashimappu River, Hobetsu district of Mukawa Town, Hobetsu, Hokkaido Island, Japan.

Horizon: Hakobuchi Group..

Biostratigraphy:

Age: Early Campanian Stage, Upper Senonian Subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

HMG 1195: Carapace, shell and girdle fragmetns.

 

Locality: Hobetsu district of Town, Hobetsu, Hokkaido Island, Japan.

Horizon: Hakobuchi Formation.

Biostratigraphy:

Age: Maastrichtian Stage, Upper Senonian Subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

HGM 1225, 1454, 1474, 1476, 1526, 1527, 1531, 1533, 1534, 1535, 1536, 1537: Partial skeletonss and shells.

 

Locality: Sumoto, Awaji Island, Japan.

Horizon: Kita-ama Formation, Izumi Group.

Biostratigraphy:

Age: Maastrichtian Stage, Upper Senonian Subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

HPMNH uncatalogued specimens: Coracoids, pubis, and shell fragments.

Private Collection: Various postcranial fragments.

 

Locality: Panketosanosawa Creek, Hobetsu District of Mukawa Town, Hobetsu, Hokkaido Island, Japan.

Horizon:Hakobuchi Group.

Biostratigraphy:

Age: Maastrichtian Stage, Upper Senonian Subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

NSM PV15022: Left quadrate, opisthotic, and columella auris.

TANIMOTO, KISHIMOTO & TANAKA, 1999

Locality: Yura-Cho, Sumoto-City, Hyogo Prefecture, Island off of Honshu, Southwest Japan.

Horizon: Izumi Group.

Biostratigraphy:

Age: Lower Maastrichtian Stage, Upper Senonian Subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

Number: Not given: Fragmentary skull and fragmentary dentary.