Species: rex (MARSH, 1877) GALTON, 1977
Etymology: Latin, rex, "king."
= Nanosaurus rex MARSH, 1877
= Laosaurus rex (MARSH, 1877) MARSH, 1896

Holotype: YPM 1915

Locality: Como Bluff, Albany County, Wyoming.

Horizon: Member? Morrison Formation.

Biostratigraphy: Zone?

Age: Age?, Stage?, Malm Epoch, Late Jurassic.

Material: Left femur.

Reconstruction of femur; medial, laterial, posterior and anterior view.

Referred material:

GALTON, 1983

Locality: Reed’s Quarry YPM Quarry 9, Como Bluff, Albany County, Wyoming.

Horizon: Member? Morrison Formation.

Biostratigraphy: Zone?

Age: Age?, Stage?, Malm Epoch, Late Jurassic.

Material:

YPM 7451: Left maxillary tooth.

YPM 7452: Right dentary tooth.

Several very small dentary and maxillary teeth.

AMNH 11527, 11528: Teeth.
Note: These were refereed to Fabrosauridae in Prothro, 1981.

GALTON & JENSEN, 1973

Locality: Approximately 5 miles east of Willow Springs, Emery County, Utah.

Horizon: Upper or Brushy Basin Member, Morrison Formation.

Biostratigraphy: Zone 3.

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

Material:

BYU ESM-163R: Skeleton lacking skull, first cervicals, lower upper legs and caudals.

GLUT, 2006

Locality: Howe Ranch, Howe Quarry located at the very foot of the big Horn Mountains, near the original Cloverly Post Office, 25 miles northeast of Greybull, and 25 miles south of the Montana line, Big Horn County, Wyoming.

Horizon: Salt Wash Member, Morrison Formation.

Biostratigraphy: Zone 2.

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

Material:

Number: Not given: Skull and skeleton.

Note: Nicknamed "Barbara".

Number: Not given: A second skull and skeleton.

 

PEIRCE, 2006

Locality: V9138, Little Houston Quarry, approximately 20 km west of Sundance in southern Crook Country, just north of Little Houston Creek, northeast Wyoming.

Horizon: Member? Morrison Formation.

Biostratigraphy: Zone?

Age: Age? Stage? Epoch? Late Jurassic.

Material:

MWC 5822: Lower jaw.

 

TURNER & PETERSON, 1999

Locality: DMNH Quarry 4 (Carpenter’s 1990 Quarry or Valley of Death 5 Quarry), Fremont County, Colorado.

Horizon: Lower Upper Brushy Basin Member, Morrison Formation.

Biostratigraphy: Upper zone 2.

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

Material:

Number: Not given:

 

= Laosaurus gracilis MARSH, 1878
Etymology: Latin, gracilis, "slender."

Holotype: YPM 1875

Locality: Reeds YPM Quarry 9, (Mammal Quarry), T22N, R77W, Sec. 12, Como Bluff West (west of Marshall Road), Albany County, Wyoming.

Horizon: Brushy Basin Member, Morrison Formation.

Biostratigraphy: Zone 3.

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

Material: 13 dorsal centra, a partial left lower leg, a few pieces from the right pes, lateral distal tarsal, distal ends of metatarsals I and IV.

Referred material:

GILMORE, 1909

Locality: Quarry, Como Bluff, Albany County, Wyoming.

Horizon: Member?, Morrison Formation.

Biostratigraphy: Zone?

Age: Age? Stage?, Malm Epoch, Late Jurassic.

Material:

USNM 5808: Right femur.

 

OSTROM & McINTOSH, 1966

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:

Number: Not given:

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