Genus: Othnielosaurus GALTON, 2006
Etymology: In honor of Othniela Charles Marsh, and Greek, sauros, "lizard."

Species: consors (MARSH, 1894) GALTON, 2006
Etymology:
= Laosaurus consors MARSH, 1894
= Othnielia consors (MARSH, 1894) GALTON, 1977

Holotype: YPM 1882

Locality: Reed’s YPM Quarry 7, (Three Trees Quarry), T22N, R77W, Sec. 18, 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: Articulated skeleton on a slab mount and parts of a skeleton and a few duplicated bones.

Note: Pathological features in all digits (CRUZADO-CABALLERO, DIAZ-MARTINEZ, ROTHSCHILD, BEDELL & PEREDA-SUBERBIOLA, 2020).

Referred material:

= Laosaurus ?consors OSTROM & McINTOSH, 1966

= Othnielia rex GALTON, 1983

Locality: Reed's Quarry 9 (Mammal Quarry), Como Bluff, (Sec. 12, T22N, R77W), Carbon County, Wyoming.

Horizon: Upper or Brushy Basin member, Morrison Formation.

Biostratigraphy: Zone 3.

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

Material:

YPM 9522: Premaxillary tooth.

AMNH 14328: Premaxillary tooth.

AMNH 11526: Maxillary tooth.

 

Locality: Unknown, Aurora Quarry, Como Bluff? Wyoming.

Horizon: Member? Morrison Formation.

Biostratigraphy: Zone?

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

Material:

Cope Collection AMNH 2372: An isolated left dentary tooth of a juvenile.

 

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:

USNM 5829: Isolated left dentary.

 

BAKKER, GALTON, SIEGWARTh & FILLA, 1990

Locality: Felch Quarry, Oil Creek, Colorado.

Horizon: Member? Morrison Formation.

Biostratigraphy: Zone?

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

Material:

UCM Field No. C-1-1984: Maxillary tooth.

 

FULLER, 2009

Locality: Dana Quarry, Ten Sleep, Washakie County, Wyoming.

Horizon: Member?, Morrison Formation.

Biostratigraphy: Zone?

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

Material:

Number: Not given: Skeletal remains.

 

LEVITT, 2007

Locality: Westphal Quarry, near Hyattville, Big Horn Basin, Big Horn County, Wyoming.

Horizon: Member? Morrison Formation.

Biostratigraphy: Zone?

Age: Age? Stage? Late Jurassic.

Material:

Number: Not given: Left dentary, teeth, right femur.