Species: precedens MARSH, 1892
Etymology:

Holotype: USNM 2143

Locality: "Peterson Quarry", Niobrara County, Wyoming.

Horizon: Lance Formation.

Biostratigraphy:

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

Material: Anterior trunk vertebrae.

Referred material:

ESTES, 1964

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

Horizon: Lance Formation.

Biostratigraphy:

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

Material:

UCMP 45940, 46060, 46070, 46520, 46623, 500001-50014, 50027, 53924-53929, 54219: Vertebrae.

UCMP 47764, 49998, 49999, 53935: Maxillary fragments.

UCMP 49997, 50000, 50020: Dentary fragments.

 

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.

Horizon: Lance Formation.

Biostratigraphy:

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

Material:

UCMP 53930-53935, 53937-53940: Vertebrae.

 

Locality: UCMP V-5815, Hatcher Number 2, western side of a cross-stratified sandstone erosional remnant near the center of a large blowout on the crest of a ridge, the distance form the nearest point on the road, approximately 150 yards south of the quarry, to the Johnson ranch is 0.4 miles, Niobrara County (Formerly Converse County), Eastern Wyoming.

Horizon: Lance Formation.

Biostratigraphy:

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

Material:

UCMP 53556-53557, 53559-53561: Vertebrae.

 

ESTES, BERBERIAN & MESZOELY, 1969

Locality: Bug Creek Anthills locality, McCone County, Montana.

Horizon: Hell Creek Formation.

Biostratigraphy:

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

Material:

MCZ 3667: A few vertebrae.

MCZ 3668: Coossified Frontal.

 

FOX, 1975

Locality: 18 miles (29km) east of the village of Milk River, from Vergidgris Coulee, localities UAMR 2 and 6, Warner County, Alberta Province, Canada.

Horizon: Milk River Formation.

Biostratigraphy:

Age: Aquilian age, Late Santonian Stage, Senonian subepoch, Upper Gulf epoch, Late Cretaceous.

Material:

UA 12002, 12007, 12010, 12014: Vertebrae.

9 more vertebrae.

 

LONGRICH, BHULLAR & GAUTHIER, 2012

Locality: Wyoming.

Horizon: Lance Formation.

Biostratigraphy:

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

Material:

AMNH 22413: Posterior maxilla.

AMNH 26999: Cervical vertebra.

AMNH 26833: Middle trunk vertebra.

YPM-PU 16845: Posterior trunk vertebra.

 

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:

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Species: cosgriffi ARMSTRONG-ZIEGLER, 1978
Etymology: In honor of Dr. John W. Cosgriff.

Holotype: MNA PL. 1612

Locality: MNA site A (= MNA 107), Hogback South, 7 1/2 quadrangle, T26N, R16W, 108'29"10W Long. 36'16"10N Lat. 30 miles southwest of Farmington, San Juan County, New Mexico.

Horizon: Fruitland Formation.

Biostratigraphy:

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

Material: Trunk vertebra.

Referred material:

Locality: Bug Creek anthills, McCone County, Montana.

Horizon: Hell Creek Formation.

Biostratigraphy:

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

Material:

MCZ 3669: Fragmentary vertebra.

_____________________________________________________________________________________

Species: dabiebus RAGE & WERNER, 1999
Etymology: From Al Dabieb, a local Sudanese name for snakes.

Holotype: Vb-673

Locality: 200 km northwest of Khartoum, Wadi Abu Hashim, Sudan.

Horizon: Wadi Abu Hashim Member, Wadi Milk Formation.

Biostratigraphy:

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

Material: 1 mid-trunk vertebra.

Referred material:

Vb-674-679: 6 trunk vertebrae.

 

= Coniophis cf. C. dabiebus RAGE & WERNER, 1999

Locality: 200 km northwest of Khartoum, Wadi Abu Hashim, Sudan.

Horizon: Wadi Abu Hashim Member, Wadi Milk Formation.

Biostratigraphy:

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

Material:

Vb-680: Vertebra.