Genus: Laosaurus MARSH, 1878 (nomen dubium)
Etymology: Greek, laos, “stone” and Greek, sauros, "lizard": Fossil lizard.

Species: celer MARSH, 1878 (nomen dubium)
Etymology: Latin, celer, "swift."
= Laosaurs aler SAUVAGE, 1880 (sic)

Holotype: YPM 1874

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

Material: 2 complete vertebral centra and 9 half centra.