Reptilia - Dinosauria - Diplodocidae

Synonym: Barosaurus affinis Marsh 1899

Full reference: O. C. Marsh. 1890. Description of new dinosaurian reptiles. The American Journal of Science, series 3 39:81-86

Belongs to Barosaurus according to L. M. Ibiricu et al. 2012

Sister taxon: Barosaurus gracilis

Type specimens:

• Barosaurus lentus: YPM 429, a partial skeleton. Its type locality is Hatch Ranch, Piedmont Butte, which is in a Kimmeridgian/Tithonian wet floodplain claystone in the Morrison Formation of South Dakota.
• Barosaurus affinis: Its type locality is Hatch Ranch, Piedmont Butte, which is in a Kimmeridgian/Tithonian wet floodplain claystone in the Morrison Formation of South Dakota.

Ecology: ground dwelling herbivore

Average measurements (in mm): coracoid 297.0 x 420.0, femur 1440.0 x 202.0, femur circumference 540.0, fibula 1120.0 x 99.0, fibula circumference 267.0, humerus 1034.0 x 151.0, humerus circumference 440.0, radius 930.0 x 77.0, radius circumference 249.0, scapula 1240.0 x 195.0, tibia 1064.0 x 136.0, tibia circumference 368.0, ulna length 940.0, ulna circumference 302.0

Estimated body mass: 12.5 tons based on femur circumference, femur length, and humerus circumference