= Mesodermochelys sp cf. M. undulatus SATO, KONISHI, HIRAYAMA & CALDWELL, 2012
Locality: Kotanbetsu River, Tomamae Town, Hokkaido Island, Japan.
Horizon: Upper Yezo Group.
Biostratigraphy:
Age: Early Campanian Stage, Upper Senonian Subepoch, Upper Gulf Epoch, Late Cretaceous.
Material:
HMH 151807: Partial skull and a peripheral.
HMG 366, 367: Shell fragments.
Locality: Rubeshobezawa of Abeshinai River, Nakagawa Town, Hokkaido Island, Japan.
Horizon: Upper Yezo Group.
Biostratigraphy:
Age: Early Campanian Stage, Upper Senonian Subepoch, Upper Gulf Epoch, Late Cretaceous.
Material:
NMV 3: Proximal portion of right humerus.
Locality: Nio River, Kakagawa Town, Hokkaido Island, Japan.
Horizon: Osoushinai Formation, Upper Yezo Group.
Biostratigraphy:
Age: Campanian Stage, Upper Senonian Subepoch, Upper Gulf Epoch, Late Cretaceous.
Material:
NMV 50, 53: Partial carapace and femur.
Locality: Wakkawenbetsu River, Nakagawa Town, Hokkaido Island, Japan.
Horizon: Upper Yezo Group.
Biostratigraphy:
Age: Santonian Stage, Upper Senonian Subepoch, Upper Gulf Epoch, Late Cretaceous.
Material:
NMV 51: Neurals.
Locality: Akanosawa of Obirashibe River, Obira Town, Hokkaido Island, Japan.
Horizon: Upper Yezo Group.
Biostratigraphy:
Age: Santonian Stage, Upper Senonian Subepoch, Upper Gulf Epoch, Late Cretaceous.
Material:
NSM PV15017: Partial shell and skeleton
Locality: Horodatezawa of Kotanbetsu River, Toumamae Town, Hokkaido Island, Japan.
Horizon: Upper Yezo Group.
Biostratigraphy:
Age: Santonian Stage, Upper Senonian Subepoch, Upper Gulf Epoch, Late Cretaceous.
Material:
THU g2161: Partial carapace.
Locality: Haboro River, Haboro Town, Hokkaido Island, Japan.
Horizon: Upper Yezo Group.
Biostratigraphy:
Age: Santonian Stage?, Upper Senonian Subepoch, Upper Gulf Epoch, Late Cretaceous.
Material:
MCM A133: Carapce.
Locality: Kaminosawa of Kotanbetsu River, Tomamae Town, Hokkaido Island, Japan.
Horizon: Upper Yezo Group.
Biostratigraphy:
Age: Santonian Stage, Upper Senonian Subepoch, Upper Gulf Epoch, Late Cretaceous.
Material:
MCM A570: Partial carapace, and vertebrae.
Locality: Shionoe, Takamatsu City, Kagawa, Island, Japan.
Horizon: Izumi Group.
Biostratigraphy:
Age: Camapnian Stage, Upper Senonian subepoch, Upper Gult Epoch, Late Cretaceous.
Material:
Private Collection: Humerus.