LANGSTON, STANDHARDT & STEVENS, 1989
Locality: Big Bend National Park, Brewster County, Texas.
Horizon: Lower Aguja Formation.
Biostratigraphy:
Age: Judithian age, Upper Campanian Stage, Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.
Material:
Number: Not given:
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LAWSON 1972
Locality: Glenn Draw, 4.3 kilometers southeast of Glenn Springs, Big Bend National Park, Brewster County, Texas.
Horizon: Lower Tornillo.
Biostratigraphy:
Age: Lancian Age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Upper Gulf Epoch, Late Cretaceous.
Material:
TTU 5-104-47: Plastron and fragments of carapace.
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LIVELY, 2015b
Locality: Within Grand Staircase-Escalante National Monument, Garfield County, Utah.
Horizon: Middle unit, Kaiparowits Formation.
Biostratigraphy:
Age: Campanian Stage, Senonian Subepoch, Gulf Epoch, Late Cretaceous.
Material:
UMNH VP 20181: A nearly complete carapace and plastron.
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SULLIVAN, JASINSKI, & LUCAS, 2013
Localtiy: SMP locality 421, Alamo Mesa (southwest), SW 1/4, Sec. 27, T24N, R12W, San Juan County, New MExico.
Horizon: Hunter Wash Member, Kirtland Formation.
Biostratigraphy:
Age: Kirtlandian age, Upper Campanian Stage, Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.
Material:
SMP VP-2100: Nearly complete plastron with carapace fragments.
Locality: 421, New Mexico.
Horizon: Hunter Wash Member, Kirtland Formation.
Biostratigraphy:
Age: Kirtlandian Age, Late Campanian Stage, Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.
Material:
SMP VP-2168: Nearly complete carapace and plasteron.