Species: insignis COPE, 1873
Etymology:

Holotype: AMNH 1846

Locality: Bijou Creek, 40 miles east of Denver, Colorado.

Horizon:

Biostratigraphy:

Age: Late Cretaceous.

Material: Fragment of hypoplastron.
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Species: punctulatus COPE, 1873/4
Etymology:

Holotype: AMNH 1845

Locality: Bijou Creek, 40 miles east of Denver, Colorado.

Horizon:

Biostratigraphy:

Age: Late Cretaceous.

Material: Fragment of a costal plate.

Referred material:

KNOWLTON, 1911/COPE

Locality: Long Lake, North Dakota.

Horizon: Lance Formation.

Biostratigraphy:

Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

Number: Not given:

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Species: coalescens COPE, 1875
Etymology:
= Aspideretes coalescens (COPE, 1875)
= Trionyx coalescens (COPE, 1875) HAY, 1902

Holotype:

Locality: Bad Lands south of Woody Mountain, latitude 49’, Longitude about 106’, Assinioboia, Saskatchewan Province, Canada.

Horizon: Judith River Formation, Judith River Group.

Biostratigraphy:

Age: Judithian age, Campanian Stage, Senonian subepoch, Upper Gulf epoch, Late Cretaceous.

Material: Portions of both carapace and plastron.
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Species: costatus COPE, 1875
Etymology:

Holotype:

Locality: Bad Lands south of Woody Mountain, latitude 49’, Longitude about 106’, Assinioboia, Saskatchewan Province, Canada.

Horizon: Judith River Formation, Judith River Group.

Biostratigraphy:

Age: Judithian age, Campanian Stage, Senonian subepoch, Upper Gulf epoch, Late Cretaceous.

Material: A piece of a costal, a fragment of probably the right hypoplatron, and another small undermined fragment.

Referred material:

KNOWLTON, 1911/BROWN

Locality: 12 miles south of the Missouri River, on Hell Creek, Montana.

Horizon: Hell Creek Formation.

Biostratigraphy:

Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

Number: Not given:

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Species: robustus GILMORE, 1919
Etymology:

Holotype: USNM 8538

Locality: 3 1/2 miles southwest of Kimbetoh, near the south side of sec. 4, T 22N, R 10W, San Juan County, New Mexico.

Horizon: Hunter Wash Local Fauna, Lower Kirtland Formation.

Biostratigraphy:

Age: Kirtlandian age, Upper Campanian Stage- Lower Maastrichtian Stage, Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.

Material: Nearly perfect carapace and the hyoplastron and hypoplastron of the right side.

Referred material:

SULLIVAN, 2006

Locality: Eagle's Nest Flat, SMP locality 398, Ah-Shi-Sle-Pah Wilderness Study Area, San Juan Basin, San Juan County, New Mexico.

Horizon: Fossil Forest Member, Fruitland Formation.

Biostratigraphy:

Age: Kirtlandian Age, Late Campanian Stage, Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

SMP VP-1667: Incomplete nuchal, right and left xiphiplasra and associated fragments.

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Species:? jaxarticus RIABININ, 1938
Etymology:

Holotype:

Locality: Near Station Sary-Agach, Tashkent-Chimkent District, South Kazakhstan.

Horizon:

Biostratigraphy:

Age: Cenomanian, Cenomanian Stage, Upper Gallic subepoch, Lowest Gulf Epoch, Late Early to Early Middle Cretaceous.

Material: