Genus: Latoplatecarpus KONISHI & CALDWELL, 2011
Etymology: Latin (adjective), lato (latus), "wide or extensive" referring to widely separated anterolateral processes of the frontal + Platecarpus, referring to the close evolutionary affinity of the new genus to Platecarpus.

Species: willistoni KONISHI & CALDWELL, 2011
Etymology: In honor of Samuel W. Williston who created a framework for understanding these extinctsquamates from teh Western Interior Basin of North America.

Holtoype: RTMP 84.162.01

Locality: Found in the vicinity of Morde, southern Manitoba Province, Canada.

Horizon: Pembina Member, Lower Pierre Shale Formation.

Biostratigraphy: Baculites obtusus ammonite zone.

Age: Lowermost Middle Campanian Stage, Senonian subepoch, Upper Gulf epoch, Late Cretaceous.

Material: An articulated skull, mandibles, 18 consecutive anterior vertebrae including atlas and axis, left scapula, rib and other miscellaneous bone fragments, all considered to belong to a single, relatively small individual.

Referred material:

= Platecarpus ictericus

Locality: Mule Creek Junction, N half Sec. 7, T38N, R60W, Niobrara County, Wyoming.

Horizon: Sharon Springs Member, Lower Pierre Shale Formation.

Biostratigraphy:

Age: Lowermost Middle Campanian Stage, Senonian subepoch, Upper Gulf epoch, Late Cretaceous.

Material:

AMNH 2182: Semi-articulated skull and mandibles with anterior muzzle part missing.

 

Locality: 1.5 miles (2.4 km) east of Route 34, south side of North Sulphur River, Hunt County, northeastern Texas.

Horizon: Ozan Formation.

Biostratigraphy: Corresponding to b. mclearni Ammonite Zone.

Age: Lowermost Middle Campanian Stage, Senonian subepoch, Upper Gulf epoch, Late Cretaceous.

Material:

DMNH 8769: Disarticulated but nearly complete and well-preserved skull elements, partial mandibles, 7 cervical, 7 dorsal, 8 intermidate caudal vertebrae and ribs.

Frontal of DMNH 8769 from KONIHI & CALDWELL, 2011.

 

Locality: "Twenty-three miles (23 miles (37 km) W of Edgemont and 1 mile (1.6 km) N of Red Bird, Niobrara County, Wyoming.

Horizon: Sharon Springs Member, Lower Pierre Shale Formation.

Biostratigraphy: B. obtusus and B. mclearni Ammonite zones.

Age: Lowermost Middle Campanian Stage, Senonian subepoch, Upper Gulf epoch, Late Cretaceous.

Material:

SDSM 30139: Well-preserved, semi-articulated skull, mandibles, nearly complete presacral, 11 intermediate caudal vertebrae in articulation, both pectoral girdles and interclavicle.

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Species: nichollsae (CUTHBERSTON, MALLON, CAMPIONE, & HOLMES, 2007) KONISHI & CALDWELL, 2011
= Plioplatecarpus nichollsae CUTHBERTSON, MALLON, CAMPIONE, & HOLMES, 2007
Etymology: In honor of the late Dr. Elizabeth L. Nicholls, who greatly contributed to our knowledge of Mesozoic marine reptiles from Canada and did much to characterize the Pembina Member fauna of southwestern Manitoba.
= Genus: Nova CUTHERBTSON, MALLON, CAMPIONE & HOLMES, 2006

Holotype: CMN 52261

Locality: Near quarry 13, Bentonite mine about 19 km northwest of Morden, SE 1/4 Sec. 31, T 3, R 6, Southwestern Manitoba.

Horizon: Pembina Member, Lower Pierre Shale Formation (formerly Vermillion River Formation).

Biostratigraphy:

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

Material: Premaxilllae, maxillae, mandibles, basioccipital, frontoparietal skull table, postorbito-frontals, partial left squamosal, partial left supratemporal, quadrates, pterygoids, complete cervical vertebral series, 23 dorsal vertebrae, 11 pygal vertebrae, 5 caudal vertebrae, ribs, scapulae, coracoids, humeri, radii, ulnae, left phalanges, left ilium, ?left ischium, ?left femur, left tibia and fibula, left astragalus, left calcaneum, left fourth distal tarsal and left pedal phalanges.

Referred material:

KONISHI & CALDWELL, 2009

Locality: Morden-Miami area southern Monitoba, Canada.

Horizon: Pembina Member, Lower Pierre Shale Formation.

Biostratigraphy:

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

Material:

RTMP 83.24.01: Well preserved but disarticulated skull including braincase and first three cervical vertebrae.

 

Locality: North Cox site, near Miami, NW 1/4, Sec. 35, T4, R7, Manitoba, Canada.

Horizon: Pembina Member, Lower Pierre Shale Formation.

Biostratigraphy:

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

Material:

M 83.10.18: Isolated partial skull elements and right humerus.

NICHOLLS, 1988

Locality: Manitoba Province, Canada.

Horizon: Pembina Member, Lower Pierre Shale Formation.

Biostratigraphy:

Age: Lower Middle Campanian Stage, Senonian subepoch, Upper Gulf epoch, Late Cretaceous.

Material:

M73.08.02, M83.08.18: Partially articulated skeleton with skull elements.

 

RUSSELL, 1967

Locality: W side NW 1/4 SW 1/4, Sec. 29, T5N, R8E, Custer County, South Dakota.

Horizon: Sharon Springs Member, Lower Pierre Shale Formation.

Biostratigraphy:

Age: Lower Middle Campanian Stage, Senonian subepoch, Upper Gulf epoch, Late Cretaceous.

Material:

FMNH (CHMN) PR465:

FMNH (CHMN) PR466:

FMNH (CHMN) PR467:

YPM 1 unnumbered specimen.

 

Locality: Alabama.

Horizon: Lower Demopolis Chalk Formation.

Biostratigraphy:

Age: Lower Middle Campanian Stage, Senonian subepoch, Upper Gulf epoch, Late Cretaceous.

Material:

GSATC 220: