Argentinosaurus is a genus of titanosaur sauropod dinosaur first discovered by Guillermo Heredia in Argentina. The generic name refers to the country in which it was discovered. The dinosaur lived on the then-island continent of South America somewhere between 97 and 94 million years ago, during the Late Cretaceous Epoch. It is the heaviest dinosaur ever discovered. It weighed around 90-100 short tons and was over 10 feet long.


Not much of Argentinosaurus has been recovered. The holotype included three anterior dorsal vertebrae, three posterior dorsal vertebrae, first to fifth sacrum vertebrae (only the ventral sector of the vertebral bodies), most of the sacral ribs of the right side, great part of a fragmented dorsal rib, and the right tibia. One vertebra had a length of 1.59 meters (spine to the ventral border) and the tibia was about 155 centimeters (58 inches). Besides these, an incomplete femur (MLP-DP 46-VIII-21-3) is assigned to Argentinosaurus; this incomplete femur shaft is about 1.18 meters. The proportions of these bones and comparisons with other sauropod relatives allow paleontologists to estimate the size of the animal.An early reconstruction by Gregory S. Paul estimated Argentinosaurus at between 30–35 metres (98–115 ft) in length and with a weight of up to 80–100 tonnes (88–110 short tons). Other estimates have compared the fragmentary material to relatively complete titanosaurs to help estimate the size of Argentinosaurus. In 2006 Carpenter used the more complete Saltasaurus as a guide and estimated Argentinosaurus at 30 metres (98 ft) in length. An unpublished estimate used published reconstructions of Saltasaurus, Opisthocoelicaudia, and Rapetosaurus as guides and gave shorter length estimates of between 22–26 metres (72–85 ft). Weight estimates are less common, but Mazzetta et al. (2004) provide a range of 60–88 tonnes (66–97 short tons), and consider 73 tonnes (80 short tons) to be the most likely, making it the heaviest sauropod known from good material. Amphicoelias was bigger than Argentinosaurus if it really existed.

The Land Before Time

They are background characters in The Land Before Time X: The Great Longneck Migration. Many are seen in the background of a few different scenes in the movie. For instance, a female Argentinosaurus can be seen near the ending, carrying her hatchlings on her back. Also, two Argentinosaurus hatchlings are also seen running after Bron and Shorty. A few also cameo towards the beginning and end of The Land Before Time XII: The Great Day of the Flyers. They bear a little resemblance to Camarasaurus and are often dark purple with a few lavender spots or yellowish with a faint green hue. In real life, Argentinosaurus was bigger than all other sauropods from the entire Land Before Time series.


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