louisae was named by William Holland, in 1915. It is the holotype for the genera, and two partial skeletons have been found including part of a skull. ajax is the type species of the genera, and was named by the paleontologist Othniel Charles Marsh in 1877 after Ajax, the hero from Greek mythology. Fossils of this animal have been found in Nine Mile Quarry and Bone Cabin Quarry in Wyoming, and at sites in Colorado, Oklahoma, Utah, USA.
In 2015, the name Brontosaurus was assigned to its own genus due to a study proving that Apatosaurus and Brontosaurus were different.
The name was not formally removed from the records of paleontology until 1974. In 1903, it was discovered that the apatosaur was in fact a juvenile brontosaur, and the name Apatosaurus, having been published first, was deemed to have priority as the official name Brontosaurus was relegated to being a synonym. In 1877, Othniel Charles Marsh published notes on his discovery of the Apatosaurus, and then in 1879 described another, more complete dinosaur - the Brontosaurus. So it might've grazed on soft marshy reeds or thin plant stalks.Ī modern view of Apatosaurus Classification and history To aid in processing food, Apatosaurus may have swallowed gizzard stones (gastroliths) the same way many birds do today - its jaws alone were not sufficient to chew tough plant fibers, a common sight in many Diplodocid animals during the Late Jurassic. Fossilized footprints indicate that it probably lived in herds.
In fact, like its relative Diplodocus, Apatosaurus was a grazing animal with a very long neck, and a long tail that served as a counterweight. The findings do not support this and debunked this speculation. It was once believed that Apatosaurus was too massive to support its own weight on dry land, so it was theorized that the sauropod must have lived partly submerged in water, perhaps in a swamp.
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