![]() In early 1989, the Argentine palaeontologist José F. Heredia, initially believing he had discovered petrified logs, informed the local museum, the Museo Carmen Funes, whose staff members excavated the bone and stored it in the museum's exhibition room. ![]() The first Argentinosaurus bone, which is now thought to be a fibula (calf bone), was discovered in 1987 by Guillermo Heredia on his farm "Las Overas" about 8 km (5 mi) east of Plaza Huincul, in Neuquén Province, Argentina. Skeletal reconstruction, holotype material in white, referred femoral shaft in green, referred femur in blue, unknown bones in grey The fossils of Argentinosaurus were recovered from the Huincul Formation, which was deposited in the middle Cenomanian to early Turonian ages (about 96 to 92 million years ago) and contains a diverse dinosaur fauna including the giant theropod Mapusaurus. A computer model of the skeleton and muscles estimated this dinosaur had a maximum speed of 7 km/h (5 mph) with a pace, a gait where the fore and hind limb of the same side of the body move simultaneously. Arguments revolve around the position of the recovered vertebrae within the vertebral column and the presence of accessory articulations between the vertebrae that would have strengthened the spine. The fragmentary nature of Argentinosaurus remains makes their interpretation difficult. ![]() The generic name Argentinosaurus means "Argentine lizard", and the specific name huinculensis refers to its place of discovery, Plaza Huincul. Argentinosaurus was named by Bonaparte and the Argentine palaeontologist Rodolfo Coria in 1993 the genus contains a single species, A. Additional specimens include a complete femur (thigh bone) and the shaft of another. A scientific excavation of the site led by the Argentine palaeontologist José Bonaparte was conducted in 1989, yielding several back vertebrae and parts of a sacrum-fused vertebrae between the back and tail vertebrae. The first Argentinosaurus bone was discovered in 1987 by a farmer on his farm near the city of Plaza Huincul. It was a member of Titanosauria, the dominant group of sauropods during the Cretaceous. Although it is only known from fragmentary remains, Argentinosaurus is one of the largest known land animals of all time, perhaps the largest, reaching 30–35 metres (98–115 ft) in length and 60–75 tonnes (66–83 short tons) in body mass. Argentinosaurus is a genus of giant sauropod dinosaur that lived during the Late Cretaceous period in what is now Argentina.
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