Species: osborni WILLISTON, 1902
Etymology: In honor of Henry Fairfield Osborn.
= Polycotylus osborni (WILLISTON, 1902) WATSON, 1951?
= Trinacromerum osborni (WILLISTON, 1902) KUHN, 1934

Holotype: KUVP 1300

Locality: Unknown, east of Wallace, Logan County, Kansas.

Horizon: Smoky Hill Member, Niobrara Formation.

Biostratigraphy: Hesperornis zone.

Age: Santonian or Campanian Stage, Senonian Subepoch, Gulf Epoch, Late Cretaceous.

Material: Skull and incomplete skeleton.
Note: Gastroliths were found.

Referred material:

BONNER, 1964

Locality: Russell Springs, Logan County, Kansas.

Horizon: Smoky Hill Member, Niobrara Formation.

Biostratigraphy:

Age: Santonian or Campanian Stage, Senonian Subepoch, Gulf Epoch, Late Cretaceous.

Material:

FHKSCHM 7960: Skull and skeleton.

 

CARPENTER, 1996

Locality: Near Russell Springs, Logan County, Kansas.

Horizon: Smoky Hill Member, Niobrara Formation.

Biostratigraphy: Hesperornis zone.

Age: Santonian or Campanian Stage, Senonian Subepoch, Gulf Epoch, Late Cretaceous.

Material:

FHSM VP404: A nearly complete skeleton.

 

Locality: Logan County, Kansas.

Horizon: Smoky Hill Member, Niobrara Formation.

Biostratigraphy:

Age: Santonian or Campanian Stage, Senonian Subepoch, Gulf Epoch, Late Cretaceous.

Material:

MCZ 1064: Partial skeleton and skull of a young individual.

 

Locality: Red Bird, Niobrara County, Wyoming.

Horizon: Sharon Springs Member, Pierre Shale.

Biostratigraphy:

Age: Upper Lower to Lower Middle Campanian Stage, Senonian Subepoch, Upper Gulf Epoch, Late Cretaceous

Material:

UCM 35059: Partial skeleton and skull.

AMNH 5834: Complete skull of a juvenile.

 

Locality: Hat Creek drainage, Fall River County, South Dakota.

Horizon: Sharon Springs Member, Pierre Shale.

Biostratigraphy:

Age: Upper Lower to Lower Middle Campanian Stage, Senonian Subepoch, Upper Gulf Epoch, Late Cretaceous

Material:

USNM 50133: Skull.

USNM 55810: Fragmentary skull and partial skeleton of a juvenile.

KUVP 40001: Skull.

 

CICIMURRI & EVERHART, 2001/NICHOLLS, 1988

Locality: Manitoba Province, Canada.

Horizon: Pembina Member, Pierre Shale.

Biostratigraphy:

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

Material:

RTMP P80.06.12: Fragmentary specimen.
Note: The teleost Apateodus found in the stomach region.

 

RUSSELL, 1967

Locality: Locality no P6502G, lower Anderson River area, District of Mackenzie, Northwest Territory, Canadian Arctic.

Horizon:

Biostratigraphy:

Age: Late Cretaceous.

Material:

NMC 10436: Pectoral elements and a portion of the presacral vertebral column.

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Species: bonneri (ADAMS, 1974) O’KEEFE, 2008
= Trinacromerum bonneri ADAMS, 1974 (nomen vanum)
Etymology: In honor of Orville W. Bonner of KUVP.

Holotype: KUVP (KUMNH) 40002

Locality: Johnson Ranch, 4 miles west of KUHMN 40001, northern Niobrara County, Wyoming.

Horizon: Sharon Springs Member (was referred to the Redbird member), Pierre Formation.

Biostratigraphy:

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

Material: Entire vertebral column, both coracoids, scapulae, clavicles, interclavicle, humeri, proximal portions of flippers, ischia, ilia, both femora and almost entire flipper of each.

Referred material:

Locality: Wallace Ranch, southern Fall River County, South Dakota.

Horizon: Sharon Springs Member (was referred to the Redbird member), Pierre Formation.

Biostratigraphy:

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

Material:

KUVP (KUMNH) 40001: Skull, first 3 cervical vertebrae, indeterminate pectrum, left humerus and proximal epipodials, scattered dorsal vertebrae and ribs, both pubes, left ilium, and shaft and proximal end of left femur.

 

NICHOLLS, 1988

Locality: Manitoba Province, Canada.

Horizon: Pembina Member, Pierre Shale.

Biostratigraphy:

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

Material:

P73.05.02, P78.05.07, P80.03.15, P84.04.18: Partially articulated specimen.

P80.06.14, P81.05.16: Disarticulated specimens.

P73.05.02, P80.03.15, P81.05.16: Juvenile specimens.

 

Locality: South Dakota.

Horizon: Sharon Springs Member, Pierre Shale.

Biostratigraphy:

Age: Upper Lower to Lower Middle Campanian Stage, Senonian Subepoch, Upper Gulf Epoch, Late Cretaceous

Material:

As per NICHOLLS, 1988

KUVP 69467, SDSM 5092:

 

O'KEEFE, 2008

Locality: McLennan County, Texas.

Horizon: Taylor Marl.

Biostratigraphy:

Age: Late Cretaceous.

Material:

TAMU 3001:

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Species: herschelensis SATO, 2005
Etymology: In reference to where the specimen was found, Herschel, Saskatchewan Province, Canada.
= Novae? SATO & TOKARYK, 1999

Holotype: RSM P2310.1

Locality: Herschel, west of Saskatoon, Saskatchewan Province, Canada.

Horizon: Bearpaw Formation.

Biostratigraphy:

Age: Upper Campanian-Lower Maastrichtian Stage, Upper Senonian Subepoch, Upper Gulf Epoch, Late Cretaceous.

Material: Skull, mandible, vertebre, ribs, pectoral and pelvic girdles, and distal phalanges.

Referred material:

RSM P2310.2, 3: Badly damaged propodial bones.

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Species: tropicensis McKEAN, 2012
Etymology: In reference to the Tropic Shale, Tournian, Early Late Cretaceous, the formation from which this specimen and many other notable plesiosaur specimens have been discovered.
= cf. Dolichorhynchops sp SCHMEISSER & GILLETTE, 2009

Holotype: MNA V10046/GLCA 23189

Locality: MNA locality 1627, Glen Canyon National Recreation area, near the border with Grand Staircase-Escalante National Monument, Kane County, Utah.

Note: Precise locality information on file at the Museum of Northern Arizona.

Horizon: Trophic Shale.

Biostratigraphy:

Age: Lower Turonian Stage, upper Gallic subepoch, lower Gulf Epoch, Early Late Cretaceous.

Material: Complete skull, nearly complete dentition, and incomplete set of vertebrae and scapulae, coracoids, ilia, ichia, pubes, nearly complete forelimbs and hindlinbs.

Note: 289 gastroliths.

Note found with Scapanorhynchus raphiodon tooth, and may have scavenged the carcass (ALBRIGHT, GILLETTE & TITUS, 2013).

Referred material:

Locality: MNA locality 1483, Glen Canyon National Recreation area, near the border with Grand Staircase-Escalante National Monument, Kane County, Utah.

Note: Precise locality information on file at the Museum of Northern Arizona.

Horizon: Trophic Shale.

Biostratigraphy:

Age: Lower Turonian Stage, upper Gallic subepoch, lower Gulf Epoch, Early Late Cretaceous.

MNA V9431/GLCA 23761: Vertebrae, rib fragments, partial fragments of the scapulae, coracoids, ischia, and pubis, complete ilium, and many unidentified fragments.