Genus SEISMOSAURUS
Kingdom / Phylum . . . . . . . . Subphylum / Superclass . . . . Class / Subclass . . . . . . . . . . Infraclass / Division. . . . . . . . Subdivision / Infradivision . . . Superorder / Order. . . . . . . . Suborder / Infraorder . . . . . . Superfamily / Family . . . . . . . Subfamily / Genus . . . . . . . . .	Animalia / Chordata Cephalochordata / Gnathostomata Reptilia / Diapsida Archosauromorpha / Archosauria Avemetatarsalia / Ornithodira Dinosauria / Saurischia Sauropodomorpha / Sauropoda Diplodocoidea / Diplodocidae n.a. / Seismosaurus
Age: Distribution:	Late Jurassic - Early Cretaceous North America
Note: Mostly considered a junior synonym of Diplodocus (D. hallorum)   Depicted on: Bequia, Grenadines of St. Vincent, 2005 (position 2 of sheet 2) Central African Republic, 2022 (M.S. margin) Chad, 2001 (position 2 of sheet 3) Gambia, 1997 (M.S. 1) Gambia, 2003 (position 2 of sheet 1) Ghana, 1995 (position 1 of sheet 1) Sao Tome e Principe, 2004 (position 4 of sheet, probably)   Stamp booklet cover, Japan, 2003.