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.