Genus: Barosaurus MARSH, 1890
Etymology: Greek, barys “heavy, and Greek, sauros, “lizard”: “Heavy lizard”.

Species: lentus MARSH, 1890
Etymology:

Referred material:

ROTHSCHILD & MOLNAR, 2005

Locality: Quarry face as exposed inside the Dinosaur National Monument Visitor Center, Carnegie Quarry, Vernal, Uintah County, Utah.

Horizon: Brushy Basin Member, Morrison Formation.

Biostratigraphy: Zone 3.

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

Material:

DINO 874: Metatarsal II.

Note: Has a tendon calcification-exostoses, pathology.

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van der LINDEN, WILHITE, BIVENS, WOODRUFF, HUNTER, STECKO & CURTICE, 2026

Locality: Bone Cabin Quarry, 8 miles north of Como, Medicine Bow Anticline (also called Flat top Anticline), Albany County, Wyoming.

Horizon: Salt Wash Member, Morrison Formation.

Biostratigraphy: Zone 2.

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

Material:

NAMAL-106: cervidal and dorsal ribs, 8 cervical, 9 dorsal, 5 sacral adn 41 caudal vertebrae with over 30 chevrons, complete scapulocoracoid adn most elements of the hindlimbs.

Note: The two terminal caudal vertebrae are pathologic.