Species: latus MARSH, 1891
Etymology: Latin, latus, "broad, wide"; In reference to the wide frill.

Holotype: YPM 1830

Locality: Near the summit of the bluff on the north side of Lightning Creek, about 2 miles above the mouth of that stream, in the bottom and near the extreme head of a small, cry watercourse emptying into Lighting Creek, Niobrara County, Wyoming.
Note: Cow Creek, according to OSTORM & WELLNHOFFER, 1986.

Horizon: Lance Formation.

Biostratigraphy:

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

Material: Fragmentary skull and fragments of skeleton.
Note: Paleopathology, the perforation in the squamosal (LULL, 1933), 9 POLs, ventral surface of the right squamosal, POL right prefrontal (TANKE & FARKE, 2006).

Referred material:

COLBERT & BUMP, 1948

Locality: 10 miles east of Camp Crook, Harding County, South Dakota.

Horizon: Hell Creek Formation.
Note: 100 feet below the contact of this formation with the Fort Union Sandstone, Maastrichtian, Late Cretaceous.

Biostratigraphy:

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

Material:

ANSP 15192: Fragmentary skull.
Note: 4 POLs, dorsal surface of the medial parietal bar (TANKE & FARKE, 2006)

 

= Torosaurus cf. latus

Locality: East side of Fort Beck Reservoir, Hell Creek, Montana.

Horizon: Hell Creek Formation.

Biostratigraphy:

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

Material:

Milwaukee Public Museum 6841: Fragmentary skull and nearly complete skeleton.
Note: Paleopathology, a healed puncture wound and companion “stress fracture” on the anterolateral surface of the left squamosal (JOHNSON, 1989, JOHNSON & OSTROM, 1995).

 

FARKE, 2002, 2006

Locality: Montana.

Horizon: Hell Creek Formation.

Biostratigraphy:

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

Material:

MOR 981: Crushed partial skull.

MOR 1122: Nearly complete skull.

Locality: South Dakota.

Horizon: Hell Creek Formation.

Biostratigraphy:

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

Material:

SMM P97.6.1: Partial skull including frill, braincase, jugal, quadratojugal and epijugal.

 

MARSHALL & BARRETO, 2001, ANONYMOUS, 1990, FARKE, 2006

Locality:

Horizon:

Biostratigraphy:

Age: Late Cretaceous.

Material:

MPM V8149: Skull including frill, rostrum, portions of right jugal, quadratojugal, and epijugal, portion of nasal horn and postorbital horn, skeleton including right front forelimb, ribs, vertebrae, and pelvic material.

 

OSBORN, 1923

Locality: Hell Creek, Montana.

Horizon: Hell Creek Formation.

Biostratigraphy:

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

Material:

Number: Not given: Humerus.

Note: Modeled humerus for the composite skeleton of the Triceratops elatus (skull is Triceratops sternbergii, FORSTER Thesis, nomen nudum) at the American Museum of Natural History.

 

= Triceratops galeus MARSH, 1889 (nomen dubium)
Etymology: Latin, galea, "helmet."

Holotype: USNM 2410

Locality: Localty 11 of CARPENTER & YOUNG, 2002, near Brighton, Colorado.

Horizon: Arapahoe Formation.

Biostratigraphy:

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

Material: Nasal horn core.

= Torosaurus gladius MARSH, 1891
Etymology: Latin, gladus, "sword."

Holotype: YPM 1831

Locality: Near the type locality, on the divide midway between Lightning and Cow Creeks, midway between and a t a distance of about 1 mile from the mouths of those creeks, Niobrara County, Wyoming.
(Cow Creek, according to OSTORM & WELLNHOFFER, 1986)

Horizon: Lance Formation.

Biostratigraphy:

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

Material: Fragmentary skull.

A) Skull of Torosaurus latus; B) Cross-section showing position of the brain; C) side view of skull showing the brain is below the orbit; D) showing the air passage through the skull; E) Styracosaurus and Torosaurus skull showing position of the fenestra.

= Triceratops sternbergii FORSTER 1993 (nomen nudum)
Etymology: In honor of Charles M. Sternberg.

Holotype: AMNH 5116

Locality: Seven Mile Creek, Niobrara County, Wyoming.

Horizon: Lance Formation.

Biostratigraphy:

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

Material: Fragmentary skull (Male).

 

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