Diplodocus

Diplodocus Temporal range: Late Jurassic, 154–152 Ma PreЄ Є O S D C P T J K Pg N ↓
Mounted D. carnegii holotype skeleton at the Carnegie Museum of Natural History.
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Clade:	Dinosauria
Order:	Saurischia
Suborder:	†Sauropodomorpha
Clade:	†Neosauropoda
Family:	†Diplodocidae
Subfamily:	†Diplodocinae
Genus:	†Diplodocus Marsh, 1878
Type species
†Diplodocus longus nomen dubium Marsh, 1878
Other Species
†D. carnegii Hatcher, 1901 †D. hallorum (Gillette, 1991) (originally Seismosaurus)
Synonyms
Seismosaurus Gillette, 1991

Seismosaurus Gillette, 1991

Diplodocus (/dɪˈplɒdəkəs/,/daɪˈplɒdəkəs/, or /ˌdɪploʊˈdoʊkəs/) is an extinct genus of diplodocid sauropod dinosaurs whose fossils were first discovered in 1877 by S. W. Williston. The generic name, coined by Othniel Charles Marsh in 1878, is a neo-Latin term derived from Greek διπλός (diplos) "double" and δοκός (dokos) "beam", in reference to its double-beamed chevron bones located in the underside of the tail. Chevron bones of this particular form were initially believed to be unique to Diplodocus; however, since then they have been discovered in other members of the diplodocid family as well as in nondiplodocid sauropods, such as Mamenchisaurus. It is now common scientific opinion that Seismosaurus hallorum is a species of Diplodocus.