Name: Atlantosaurus ‭(‬Atlas lizard‭)‬.
Phonetic: At-lan-to-sore-us.
Named By: Othniel Charles Marsh‭ ‬-‭ ‬1877.
Synonyms: Titanosaurus montanus.
Classification: Chordata,‭ ‬Reptilia,‭ ‬Dinosauria,‭ ‬Saurischia,‭ ‬Sauropoda,‭ ‬Diplodocoidea,‭ ‬Apatosaurinae.
Species: A.‭ ‬montanus‭ (‬type‭)‬.
Diet: Herbivore.
Size: Unknown.
Known locations: USA,‭ ‬Colorado‭ ‬-‭ ‬Morrison Formation.
Time period: Late Jurassic.
Fossil representation: Two vertebrae.

       Atlantosaurus was named by Othniel Charles Marsh in‭ ‬1877,‭ ‬though his first choice of name was Titanosaurus.‭ ‬However,‭ ‬Titanosaurus had actually been established as a genus name by Richard Lydekker earlier that same year,‭ ‬so Marsh renamed his fossils as Atlantosaurus.‭ ‬At the time of their original naming,‭ ‬the two vertebrae that are the holotype fossils of Atlantosaurus were noted as having air pockets,‭ ‬something that made them unique for the time.‭ ‬In modern times however,‭ ‬these air sacs have been noted as being generic of all sauropod dinosaurs,‭ ‬which means that the holotype vertebrae of Atlantosaurus are not distinctive of a specific genus,‭ ‬which in turn is why Atlantosaurus is treated as a dubious genus of sauropod.‭ ‬Further to this,‭ ‬the vertebrae of Atlantosaurus are noted as being to a diplodocoid‭ ‬sauropod,‭ ‬possibly a robust morph known as an apatosaurine.‭ ‬In simpler terms this means that Atlantosaurus was similar to the famous Apatosaurus‭ ‬,‭ ‬though Atlantosaurus may actually even be synonymous with Apatosaurus.

Further reading
-‭ ‬Notice of new dinosaurian reptiles from the Jurassic formation.‭ ‬American Journal of Science and Arts‭ ‬14:514-516.‭ ‬-‭ ‬O.‭ ‬C.‭ ‬Marsh‭ ‬-‭ ‬1877.
-‭ ‬Skull and relationships of the Upper Jurassic sauropod Apatosaurus‭ (‬Reptilia,‭ ‬Saurischia‭)‬.‭ ‬-‭ ‬Bulletin of the Carnegie Museum,‭ ‬8:‭ ‬1‭–‬35.‭ ‬-‭ ‬D.‭ ‬S.‭ ‬Berman‭ & ‬J.‭ ‬S.‭ ‬McIntosh‭ ‬-‭ ‬1978.


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