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Camarasaurus grandis Marsh 1877 (camarasaurid)

Amniota - Dinosauria - Camarasauridae

Alternative combinations: Apatosaurus grandis, Morosaurus grandis

Synonyms: Astrodon montanus Marsh 1896, Camarasaurus impar Marsh 1878, Camarasaurus robustus Marsh 1878, Morosaurus impar Marsh 1878, Morosaurus robustus Marsh 1878, Pleurocoelus montanus Marsh 1896

Full reference: O. C. Marsh. 1877. Notice of new dinosaurian reptiles from the Jurassic formation. American Journal of Science and Arts 14:514-516

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

Sister taxa: Camarasaurus agilis, Camarasaurus lentus, Camarasaurus lewisi, Camarasaurus supremus

Type specimens:

  • Camarasaurus grandis: YPM 1905. Its type locality is Quarry 1, Como Bluff (YPM), which is in a Kimmeridgian/Tithonian wet floodplain claystone in the Morrison Formation of Wyoming.
  • Morosaurus impar: YPM 1905. Its type locality is Quarry 1, Como Bluff (YPM), which is in a Kimmeridgian/Tithonian wet floodplain claystone in the Morrison Formation of Wyoming.
  • Morosaurus robustus: YPM 1902. Its type locality is Quarry 1, Como Bluff (YPM), which is in a Kimmeridgian/Tithonian wet floodplain claystone in the Morrison Formation of Wyoming.
  • Pleurocoelus montanus: YPM 1908. Its type locality is Quarry 1, Como Bluff (YPM), which is in a Kimmeridgian/Tithonian wet floodplain claystone in the Morrison Formation of Wyoming.

Ecology: ground dwelling herbivore

Average measurements (in mm): femur length 1050.0, humerus length 864.0, ischium length 488.0, scapula 1093.0 x 635.0, ulna length 628.0

Estimated body mass: 4.90 tons based on femur length