Apatosaurus is a genus of herbivorous sauropod dinosaur that lived in North America during the Late Jurassic period. The 1st Fossil Specimens of Apatosaurus were discovered & unearthed by Othniel Charles Marsh who described and named the first-known species, A. ajax, in 1877, and a second species, A. louisae, was discovered and named by William H. Holland in 1916. Apatosaurus is a genus in the family Diplodocidae. It is one of the more basal genera, with only Amphicoelias and possibly a new, unnamed genus more primitive. Although the subfamily Apatosaurinae was named in 1929, the group was not used validly until an extensive 2015 study.
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The Animal World (1956) “under the name, Brontosaurus”