Genus: Torosaurus MARSH, 1889
Etymology: Greek, toreo, “pierce, perforate” and Greek, sauros, “lizard”: “perforated (Crest) lizard”.

Species: latus MARSH, 1891
Etymology:

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).

 

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Sp

TOKARYK, 1986

Locality: Frenchman River Valley, Saskatchewan Province, Canada.

Horizon: Frenchman Formation.

Biostratigraphy:

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

Material:

EM P16.1: A nearly complete frill.
Note: Paleopathologies? Symmetrical holes in the frill. Bilateral squamosal fenestra (TANKE & FARKE, 2006).