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Brontosaurus excelsus Marsh 1879 (diplodocid)

Reptilia - Saurischia - Diplodocidae

PaleoDB taxon number: 52982

Alternative combinations: Apatosaurus excelsius, Apatosaurus excelsus, Atlantosaurus excelsus, Camarasaurus excelsus

Synonyms: Apatosaurus amplus Marsh 1881 (no. 56548), Atlantosaurus amplus Marsh 1881 (no. 83014), Brontosaurus amplus Marsh 1881 (no. 52991)

Full reference: O. C. Marsh. 1879. Notice of new Jurassic reptiles. American Journal of Science and Arts 18:501-505

Belongs to Brontosaurus according to E. Tschopp et al. 2015

Sister taxa: Brontosaurus parvus, Brontosaurus yahnahpin

Type specimens:

  • Brontosaurus excelsus: YPM 1980, a partial skeleton. Its type locality is Quarry 10, Como Bluff (YPM), which is in a Kimmeridgian/Tithonian wet floodplain claystone in the Morrison Formation of Wyoming.
  • Brontosaurus amplus: YPM 1981. Its type locality is Quarry 11, Como Bluff (YPM), which is in a Kimmeridgian/Tithonian wet floodplain mudstone in the Morrison Formation of Wyoming.

Ecology: ground dwelling herbivore

Average measurements (in mm): femur 1732.4 x 310.0, femur circumference 730.0, fibula length 1130.0, tibia length 1080.0, tibia circumference 480.0

Estimated body mass: 32.4 tons based on femur circumference and femur length