Species: bairdi GAFFNEY, 1972
Etymology:
Referred material:
BYRANT, 1990
Locality: Eastern Montana.
Horizon: Hell Creek Formation.
Biostratigraphy:
Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.
Material:
UCMP 129934: Skull and jaws.
Locality: Wyoming.Horizon:
Biostratigraphy:
Age: Late Cretaceous.
Material:
Number: Not given:
GAFFNEY, 1972
Locality: Montana.
Horizon:
Biostratigraphy:
Age: Late Cretaceous.
Material:
FMN Pr 829: Anterior part of skull.
Locality: Bug Creek Anthills, SW 1/4, Sec. 9, T22N, R43E, McCone County, Montana.Horizon: Hell Creek Formation.
Biostratigraphy:
Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.
Material:
MCZ 3515: Right maxilla.
LYSON, 2007
Locality: North Dakota.
Horizon: Hell Creek Formation.
Biostratigraphy:
Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.
Material:
Number: Not given: 4 skulls and 2 shells.
STENERSON & O’CONNER, 1994
Locality: Northwestern South Dakota.
Horizon: Hell Creek Formation.
Biostratigraphy:
Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.
Material:
Number: Not given:
____________________________________________________________________________________
Species: cohen LYSON & JOYCE, 2009
Etymology: In honor of Steven Cohen, an avid supporter of fossil turtles and
the Marmarth Research Foundation.
Holotype: YPM 5798
Locality: Turtle Graveyard, Bucklin Township, near Marmarth, Slope County, North Dakota.
Note: More detailed information is available to qualifided persons upon request at MRF 0r YPM.
Horizon: Hell Creek Formation.
Biostratigraphy:
Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.
Material: A complete uncrushed skull, mandible, and shell.
Referred material:
MRF 257: Complete skull and mandible.
MRF 259: Complete skull.
MRF 263: Complete skull.
MRF 123: Shell missing part of carapace.
FMNH PR 829: Anterior part of skull.
UCM 37738: Skull and jaw fragments.
UCMP 114539: Fragmentary skull and jaws.
UCMP 131952: Fragmentary skull.
UCMP 131953: Skull.
UCMP 114539: Fragmentary skull and jaws.
AMNH 8277: Complete lower jaws.
Other referred specimens bases on equivalent stratigraphy:
UCMP 114680: Right and left jaw halves.
UCMP 114686: Left maxilla.
AMNH 2603: Nearly complete lower jaws.
MCZ 3515: Right maxilla.
UCMP 114644: Left maxilla.
UCMP 117154: Dentary.
UCMP 14656: Right quadrate.
UCMP 131701, 232702: Incomplete skulls.
UCMP 147458: Left mandible.
UCMP 172257: Left maxilla.
UCMP 129934: Dentary.
UCMP 259255: Fragmentary skull.
UCM 49229: Left dentary.
UCM 49230: Right and left dentary.
Note: All of these specimens were previously referred to Palatobaena bairdi (Gaffney, 1972, Archibald and Hutchison, 1979, Gaffney, 1982, Hutchison and Archibald, 1986, Holroyd and Hutichison, 2002, Hutchison and Holroyd, 2003).