Sauropoda

Sauropods Temporal range: Late Triassic–Late Cretaceous, 228–66 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Six sauropods (top left to bottom right): Patagotitan, Barosaurus, Giraffatitan, Omeisaurus, Shunosaurus, and Amargasaurus
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Clade:	Dinosauria
Clade:	Saurischia
Clade:	†Sauropodomorpha
Clade:	†Anchisauria
Clade:	†Sauropoda Marsh, 1878
Subgroups
†Amygdalodon †Blikanasaurus †Chinshakiangosaurus †Gongxianosaurus †Isanosaurus †Kotasaurus †Pulanesaura †Volkheimeria †Lessemsauridae †Gravisauria Allain & Aquesbi, 2008 †Barapasaurus †Ohmdenosaurus †Rhoetosaurus †Spinophorosaurus †Tazoudasaurus †Vulcanodon †Zizhongosaurus †Eusauropoda Sauropods of uncertain affinity †Algoasaurus †Archaeodontosaurus †Asiatosaurus †Bagualia †Bellusaurus †Bothriospondylus †Ferganasaurus †Nebulasaurus †Protognathosaurus †Qinlingosaurus †Sanpasaurus †Schleitheimia? †Tuebingosaurus? †Ultrasaurus †Yizhousaurus?
Synonyms
Opisthocoelia Owen, 1860 Cetiosauria Seeley, 1870 Diplodocia Tornier, 1913

Sauropoda (/sɔːˈrɒpədə/), whose members are known as sauropods (/ˈsɔːrəpɒdz/;^[1][2] from sauro- + -pod, 'lizard-footed'), is a clade of saurischian ('lizard-hipped') dinosaurs. Sauropods had very long necks, long tails, small heads (relative to the rest of their body), and four thick, pillar-like legs. They are notable for the enormous sizes attained by some species, and the group includes the largest animals to have ever lived on land. Well-known genera include Apatosaurus, Argentinosaurus, Alamosaurus, Brachiosaurus, Camarasaurus, Diplodocus, and Mamenchisaurus.^[3][4]

The oldest known unequivocal sauropod dinosaurs are known from the Early Jurassic.^[5] Isanosaurus and Antetonitrus were originally described as Triassic sauropods,^[6][7] but their age, and in the case of Antetonitrus also its sauropod status, were subsequently questioned.^[8][5][9] Sauropod-like sauropodomorph tracks from the Fleming Fjord Formation (Greenland) might, however, indicate the occurrence of the group in the Late Triassic.^[5] By the Late Jurassic (150 million years ago), sauropods had become widespread (especially the diplodocids and brachiosaurids). By the Late Cretaceous, one group of sauropods, the titanosaurs, had replaced all others and had a near-global distribution. However, as with all other non-avian dinosaurs alive at the time, the titanosaurs died out in the Cretaceous–Paleogene extinction event. Fossilised remains of sauropods have been found on every continent, including Antarctica.^{[10][11][12][13]}

The name Sauropoda was coined by Othniel Charles Marsh in 1878, and is derived from Ancient Greek, meaning "lizard foot".^[14] Sauropods are one of the most recognizable groups of dinosaurs, and have become a fixture in popular culture due to their impressive size.

Complete sauropod fossil finds are extremely rare. Many species, especially the largest, are known only from isolated and disarticulated bones. Many near-complete specimens lack heads, tail tips and limbs.