Diplodocus
Diplodocus Discovery and species
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Diplodocus
Diplodocus
Diplodocus Discovery and species
Sleeveless Hoodie ~ Several species of Diplodocus were described between 1878 and 1924. The first skeleton was found at Cañon City, Colorado by Benjamin Mudge and Samuel Wendell Williston in 1877, and was named Diplodocus longus (‘long double-beam’), by paleontologist Othniel Charles Marsh in 1878.[19] Diplodocus remains have since been found in the Morrison Formation of the western U.S. States of Colorado, Utah, Montana and Wyoming. Fossils of this animal are common, except for the skull, which is often missing from otherwise complete skeletons. Although not the type species, D. carnegii is the most completely known and most famous due to the large number of casts of its skeleton in museums around the world.The two Morrison Formation sauropod genera Diplodocus and Barosaurus had very similar limb bones. In the past, many isolated limb bones were automatically attributed to Diplodocus but may, in fact, have belonged to Barosaurus.[20] Fossil remains of Diplodocus have been recovered from stratigraphic zone 5 of the Morrison Formation.
Mens Sleeveless Hoodie ~ D. longus, the type species, is known from two skulls and a caudal series from the Morrison Formation of Colorado and Utah. D. carnegii (also spelled D. carnegiei), named after Andrew Carnegie, is the best known, mainly due to a near-complete skeleton collected by Jacob Wortman, of the Carnegie Museum of Natural History in Pittsburgh, Pennsylvania and described and named by John Bell Hatcher in 1901.D. hayi, known from a partial skeleton discovered by William H. Utterback in 1902 near Sheridan, Wyoming, was described in 1924. D. hallorum, first described in 1991 by Gillette as Seismosaurus halli from a partial skeleton comprising vertebrae, pelvis and ribs. George Olshevsky later attempted to emend the name as S. hallorum, citing incorrect grammar on the part of the original authors, a recommendation that has been followed by others, including Carpenter (2006).[23] In 2004, a presentation at the annual conference of the Geological Society of America made a case for Seismosaurus being a junior synonym of Diplodocus.[24] This was followed by a much more detailed publication in 2006, which not only renamed the species Diplodocus hallorum, but also speculated that it could prove to be the same as D. longus.[25] The position that D. hallorum should be regarded as a specimen of D. longus was also taken by the authors of a redescription of Supersaurus, refuting a previous hypothesis that Seismosaurus and Supersaurus were the same.
D. lacustris is a nomen dubium, named by Marsh in 1884, from remains of a smaller animal from Morrison, Colorado.[27] These remains are now believed to have been from an immature animal, rather than from a separate species. Due to a wealth of skeletal remains, Diplodocus is one of the best-studied dinosaurs. Many aspects of its lifestyle have been subjects of various theories over the years. Marsh and then Hatcher[29] assumed the animal was aquatic, because of the position of its nasal openings at the apex of the cranium. Similar aquatic behavior was commonly depicted for other large sauropods such as Brachiosaurus and Apatosaurus. However, a 1951 study by Kenneth A. Kermack indicates that sauropods probably could not have breathed through their nostrils when the rest of the body was submerged, as the water pressure on the chest wall would be too great.[30] Since the 1970s, general consensus has the sauropods as firmly terrestrial animals, browsing on trees, ferns and bushes.
related : Womens Sleeveless Hoodie ~ Womens Sleeveless Hoodie
related : Sleeveless Hoodie ~ Sleeveless Hoodie
Dendrerpeton 