Genus: Leptoceratops BROWN, 1914
Etymology: Greek, leptos, “thin, slender, small”, and Greek, ceratops, “horn face”: “small horn face”.
= Leptaceratops OSMOLSKA, 1986 (sic)

Species: gracilis BROWN, 1914
Etymology: Latin, gracilis, "slender."
= Leptoceratops gravilis HUNT & LUCAS, 1992 (sic)

Holotype: AMNH 5205

Locality: 3 miles above the Tolman Ferry, 190 feet above the Red Deer River on the left bank, Wheatland County, Alberta Province, Canada.

Horizon: Scollard Formation, Uppermost Edmonton Group.

Biostratigraphy:

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

Material: Nasals, maxillaries, portions of the orbital border, back part of crest, dentary, predentary and splenial, a series of articulated caudal vertebrae and a complete fore limb and parts of hind limb.

Quadrapedal pose.

 

 

Referred material:

RYAN & CURRIE, 1998

RTMP 93.95.1, 95.86.1: 2 partial skeletons.

 

OSTROM, 1978

Locality: Northwest of "Dumbbell Hill", Middle of SE 1/4, NW 1./4, SE 1/4, Sec. 1, T57N, R100W, Park County, Wyoming.

Horizon: "Lance" Formation.

Biostratigraphy:

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

Material:

YPM 18133: Hind part of the skeleton, isolated tooth.

 


= Leptoceratops cf gracilis OTT & BUCKLEY, 2001, OTT, 2006

Locality: Approximately 15 miles west of Camp Crook, South Dakota, and Carter County, Montana.

Horizon: Hell Creek Formation.

Biostratigraphy:

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

Material:

UWGM-200: A partial skull.

Locality: University of Wisconsin site 2000-D, from the drainage basin of the Powder River, western Carter County, Montana.

Horizon: Hell Creek Formation.

Biostratigraphy:

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

Material:

UWGM-201: A maxillary tooth with root.

 

STERNBERG, 1951

Locality: 14 miles north of the locality of the type, directly over Campkin's coal mine, in the Northeast corner of Sec. 12, T36, R22, W of 4 mer., about 1/3 1/2 miles northeast of Elnora, Red Deer County, Alberta Province, Canada.

Horizon: Scollard Formation, Uppermost Edmonton Group.

Biostratigraphy:

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

Material:

Plesiotypes

NMC 8887: Complete articulated skeleton.

NMC 8888: Consist of skeleton, complete except most of skull and jaws and part of front foot.

Note: A skeleton has been found with a furcula.

 

TANKE, 2007

Locality: Hesketh, Alberta Province, Canada.

Horizon:

Biostratigraphy:

Age: Late Cretaceous.

Material:

RTMP 94.86.1: Fragmentary skeleton.

 

Locality: Dry Island Buffalo Jump Provincial Park, Wheatland County, Alberta Province, Canada.

Horizon: Scollard Formation, Uppermost Edmonton Group.

Biostratigraphy:

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

Material:

RTMP 99.47.1: Scattered skeleton, feet, vertebrae, limb bones, rib fragments, part of articulated hips, tendons and pes.

 

Locality: Tolman Bridge, Wheatland County, Alberta Province, Canada.

Horizon: Scollard Formation, Uppermost Edmonton Group.

Biostratigraphy:

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

Material:

RTMP 2005.8.1: Phalanges, ungual, centrum, ischium, bone fragments “limb elements”, and tooth.

Plesiotype:

NMC 8889

Locality: Directly over Campkin's coal mine, 5 feet higher in the beds and less than 50 yards distinct from the above 2 specimens, in the Northeast corner of Sec. 12, T36, R22, W of 4 mer., about 1/3 1/2 miles northeast of Elnora, Alberta Province, Canada.

Horizon: Scollard Formation, Uppermost Edmonton Group.

Biostratigraphy:

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

Material: Skull, jaws, presacral vertebrae, ribs, pectoral arches except upper ends of scapulae, left fore and hind limbs, sternal and hyoid bones.