Species: altithorax RIGGS, 1903
Etymology: Latin, altithronus, ‘one enthroned on high, seated in heaven’, and Latin, thorax, ‘corselet, breastplate’; in reference to how high the chest was in this animal from the ground.
= Brachiosaurus (Brachiosaurus) altithorax (RIGGS, 1903) PAUL, 1988
= Astrodon (Brachiosaurus) altithorax (RIGGS, 1903) KINGMAN, 1962
= Brachiosaurus altus JENSEN, 1986 (sic)
Holotype: FMNH P 25107
Locality: Rigg’s Quarry 13 (Riggs Hill, Field Museum Quarry), Grand Junction, Mesa County, Colorado.
Horizon: Lower Upper Brushy Basin Member, Morrison Formation.
Biostratigraphy: Lowest zone 3.
Age: Upper Part, Comobluffian age, Kimmeridgian Stage, Uppermost Malm Epoch, Late Jurassic.
Material: Sacrum, 7 dorsal and 2 anterior caudal vertebrae, right humerus, coracoid, ilium, and femur and a number of ribs.
Locality: Reed's YPM Quarry 13, T22N, R76W, Sec. 4 or 5, Como Bluff, East (East of Marshall road), Albany County, Wyoming.
Horizon: Salt Wash Member, Morrison Formation.
Biostratigraphy: Zone 2.
Age: Comobluffian age, Kimmeridgian Stage, Uppermost Malm Epoch, Late Jurassic.
YPM 1911: Premaxillae, maxillae, lachrymals, vomers, dentaries, loose teeth and some fragments.
Note: A large incomplete Camarasaurus-like skull and dentary. This is the skull Marsh used for his first reconstruction of Brontosaurus.
Locality: Near the old Field Museum quarry.
Number: Not given: 32 caudal vertebrae, tibia and fibula.
Note: Probably belongs to type.
= Diplodocidae incertae sedis SCHWARZ, IKEJIRI, BREITHAUPT, SANDER & KLEIN, 2007 (moved to this genus by CARBALLIDO, MARPMANN, SCHWARZ-WINGS & PABST, 2012)
Locality: Howe Stephens Quarry, Big Horn County, Wyoming.
Horizon: Member?, Lower Morrison Formation.
Age: Comobluffian age, Kimmeridgian Stage, uppermost Malm Epoch, Late Jurassic.
SMA 0009: Nearly complete skeleton, mid-cervical to mid caudal and nearly all the bones in between, of a juvenile.