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Describer
Marsh, 1877 Time
Jurassic Late Kimmeridgian Tithonian Classification
Saurischia Sauropodomorpha Sauropoda Diplodocidae Diplodocinae Diet Herbivore
Fossilsite US Typespecies
Apatosaurus ajax Length 25 meter
Info Genus - Skull Apatosaurus = Brontosaurus (Marsh, 1879) Elosaurus (Peterson & Gilmore, 1902) Apatosaurus > Apatosaurus ajax = Atlantosaurus ajax (Marsh, 1877) - Steel, 1970 = Brontosaurus ajax (Marsh, 1877) - Bakker, 1986 = Atlantosaurus laticollis (Marsh, 1879) - Steel, 1970 = Atlantosaurus excelsus (Marsh, 1879) - Steel, 1970 = Camarasaurus excelsus (Marsh, 1879) - Osborn vide von Huene, 1929 = Apatosaurus amplus (Marsh, 1881) - Gilmore, 1936 = Atlantosaurus amplus (Marsh, 1881) - Steel, 1970 Apatosaurus > Apatosaurus ajax (Marsh, 1877) >> Apatosaurus laticollis (Marsh, 1879) Atlantosaurus immanis (Marsh, 1878) Apatosaurus > Apatosaurus excelsus (Marsh, 1879) >> Brontosaurus excelsus (Marsh, 1879) >>> Brontosaurus amplus (Marsh, 1881) Elosaurus parvus (Peterson & Gilmore, 1902) Apatosaurus > Apatosaurus louisae (Holland, 1915) = Atlantosaurus louisae (Holland, 1915) - Steel, 1970 = Brontosaurus louisae (Holland, 1915) - Bakker, 1986 The anatomy of Apatosaurus (Marsh , 1883; Riggs, 1903; Gilmore, 1936) is completely except for the mandible. Overall, it is similar to that of Diplodocus and Barosaurus, except that the bones, particularly those of the neck and forelimb, are much more robust, the caudal vertebrae are shorter and less specialized, and the typical forked diplodocid chevrons less developed.
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