Species: beecheri (BAUR, 1894) HAY, 1904
= Tronyx foreatus BAUR, 1894
= Hummelichelys beecheri (BAUR, 1894)

Holotype: YPM 295

Locality: Converse County, Wyoming.

Horizon: Lance Formation, (old Laramie Beds).

Biostratigraphy:

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

Material: Fragmentary shell and fragmentary skeleton.

Referred material:

ESTES, 1964

Localities: UCMP V-5714, Powder River Basin, Eastern Wyoming.

Locality: UCMP V-5820, Kent 484, found on the surface near the top of the east side of a small draw on the south side of the prominent hill northeast of the J. Krejci ranch house, Niobrara County (Formerly Converse County), Wyoming.

Locality: UCMP V-5003, S 1/2, Sec. 20, T37N, R64W, Lance Creek, Powder River Basin, Niobrara County, Wyoming.

Localities: UCMP V-5616, Altman Blowout, this large blowout, site of the UCMP field-party camps form 1956 to 1960, is just east of the crest of the divide separating Lance Creek and Hancock Creek and 100 yards east of a dirt road. Fossils were found in anthills, talus, and sandstone exposed in the blowout, which is in the NE 1/4, Sec. 9, T37N, R64W, Niobrara County (Formerly Converse County), Wyoming.

Locality: UCMP V-5620, Lull Quarry, near the head of a tributary of Buck Creek, Powder River Basin, Niobrara County (Formerly Converse County), Wyoming.

Locality: UCMP V-5711, Bushy Tailed Blowout, Quarry area includes the floor of a small blowout approximately 10 yards northwest of the highest point on the ridge forming the northeastern side of the blowouts of loc. V-5003, S 1/2, Sec. 20, T37N, R64W, Lance Creek, Powder River Basin, Niobrara County, Wyoming.

Locality: UCMP V-5817, False Disciple Point, cross-stratified sandstone and sandy shales cropping out on the top of the northern end of a long, northwestward-trending ridge that extends from the crest of the divide between the Hancock and Lance Creek drainages, Niobrara County (Formerly Converse County), Wyoming.

Horizon: Lance Formation.

Biostratigraphy:

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

Material:

Numbers: Not given: Fragments of carapace and plastron.

 

HAY, 1909

Locality: Montana.

Horizon: Judith River Formation.

Biostratigraphy:

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

Material:

CM 445, 541: Carapaces.

 

KNOWLTON, 1991/MARSH

Locality: “Ceratops beds”, near Denver, Colorado.

Horizon: Judith River Formation.

Biostratigraphy:

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

Material:

Number: Not given:

 

= Tronyx foreatus BAUR, 1894

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Species: sagatus HAY, 1908
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Species: singularis HAY, 1908
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Species: amnigenus HAY, 1910 (nomen dubium)
= Trionyx amnigenus (HAY, 1910) HUMMEL, 1932 (nomen dubium
Etymology:

Holotype: USNM 6574

Locality: Section 12, T 20 N, R22 E, Boreman County, South Dakota.

Horizon: Lance Formation.

Biostratigray:

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

Material: 2 costal fragments
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Species: reesidei GILMORE, 1919
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Species: vegetus GILMORE, 1919
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Species: quadratus GILMORE, 1919
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Species: perplexus GILMORE, 1919
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Species: alashanensis YEH, 1965
Etymology: In reference to Alshan, Inner Mongolia (Nei Monglia), China.

Holotype: IVPP V2865

Locality: Dashukou, Maortu, Alxa, Inner Mongolia (Alshan, Inner Mongolia [Nei Monglia]), China.

Horizon: Dashuigou (Tashuikou) Formation.

Biostratigraphy:

Age: Late Cretaceous.

Material: Carapace with broken anterior portion but retaining a damaged nuchal.
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