Genus: Stegosaurus MARSH, 1877
Etymology: Greek, stego, “cover” and Greek, sauros, “lizard”: “Plated lizard”.

Species: stenops MARSH, 1887
Etymology:

Holotype: USNM 4934

Locality: Marsh-Felch’s YPM Quarry 1, Garden Park, Sec. 28, T17S, R70W, Canyon City, Fremont County, Colorado.

Horizon: Salt Wash Member, Morrison Formation.

Biostratigraphy: Zone 2.

Age: Comobluffian age, Kimmeridgian Stage, uppermost Malm Epoch, Late Jurassic.

Material: Skull, lower jaws, atlas, axis, 25 presacral vertebrae, 3 sacral vertebrae, 22 caudal vertebrae, 5 cervical ribs, 12 thoracic ribs (right), 13 thoracic ribs (left), 4 chevron, left scapula, left coracoid, 2 humeri, 2 ulnae, 2 radii, 4 left metacarpals (II, III, I, V), 2 left proximal row digits III, IV, left carpus, right radial, 3 right metacarpals, 5 right phalanges, 2 femora, right tibia, right fibula, right astragalus, right calcaneum, 2 ilia, 2 ischia, 2 pubes, 17 dermal plates, 1 dermal spine and numerous dermal ossicles.

Referred specimens:

USNM 7615: Dermal ossicles, dermal plates 1-2.

ARMSTRONG, AVERETT, AVERETT, McREYNOLDS & WOLNY, 1987/BOLLAN, 1991

Locality: Bollan’s Site, Rabbit Valley, Mesa County, Western Colorado.

Horizon: Lower Part, Brushy Basin Member, Morrison Formation.

Biostratigraphy: Zone 2.

Age: Comobluffian age, Kimmeridgian Stage, uppermost Malm Epoch, Late Jurassic.

Material:

Number: Not given: 2 complete dorsal plates, 1 caudal plate, 1 cervical plate, 4 articulated tail spikes, a fifth smaller tail spike, 7 caudal vertebrae, front limb bones, hind limb bones, 1 complete manus, parts of the ilium and the ischium, several ribs, dermal ossicles, 47 vertebrae, and 12 neural spines.

Note: Bollan Stegosaur.

HARRIS & CARPENTER, 1996, CARPENTER, 1998

Locality: DMNH Quarry 6 (Small’s Quarry), DMNH Loc., 6111, 1992 Stegosaurus stenops Quarry, Garden Park, near Canon City, Colorado.

Horizon: Lower Upper Brushy Basin Member, Morrison Formation.

Biostratigraphy: Zone 2.

Age: Comobluffian age, Kimmeridgian Stage, uppermost Malm Epoch, Late Jurassic.

Material:

DMNH 2818: Skull, skeleton with skin impressions.
Note: 2 pathologic tail spikes (McWHITNEY, ROTHSCHILDS & CARPENTER, 2001)

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Sp

Locality: Reed's YPM Quarry 13, T22N, R76W, Sec. 4 or 5, Como Bluff, East (East of Marshall road), Albany County, Wyoming.

Horizon: Salt Wash Member, Morrison Formation.

Biostratigraphy: Zone 2.

Age: Comobluffian age, Kimmeridgian Stage, uppermost Malm Epoch, Late Jurassic.

Material:

USNM 7947: Dermal ossicles.