Archosauria - Dinosauria - Diplodocidae

Alternative combination: Atlantosaurus louisae

Full reference: W. J. Holland. 1916. A new species of Apatosaurus. Annals of Carnegie Museum 10(1-2):143-145

Belongs to Apatosaurus according to P. Upchurch et al. 2004

Sister taxa: Apatosaurus ajax, Apatosaurus excelsus

Type specimen: CM 3018, a skeleton. Its type locality is Dinosaur National Monument Quarry (CM), which is in a Kimmeridgian/Tithonian coarse channel fill sandstone in the Morrison Formation of Utah.

Ecology: ground dwelling herbivore

Average measurements (in mm): femur length 1790.0, humerus length 1150.0, pubis length 1190.0, radius length 800.0, scapula length 1640.0, tibia length 1120.0, ulna length 850.0

Estimated body mass: 24.6 tons based on femur length