“With this Mamenchisaurus, I'm beginning to think that you might have an interest in large dinosaurs.”
Mamenchisaurus is a gigantic genus of sauropod dinosaur that originated from Late Jurassic Asia. The largest species of dinosaur available to the Hammond Foundation, Mamenchisaurus is first unlocked for operations on the Muertes Archipelago upon completion of the Science Division's mission on Isla Sorna.
Originating in China during the Late Jurassic period, Mamenchisaurus was first cloned on Isla Sorna, the factory floor of dinosaur cloning for Jurassic Park on Isla Nublar. A population of four animals was maintained on the island prior to its abandonment in the wake of Hurricane Clarissa in the mid-1990s. Two Mamenchisaurus were briefly encountered in a large herd of herbivorous dinosaurs, by an InGen team sent to the island to round up the animals for a new iteration of Jurassic Park on the mainland. It is unknown if any Mamenchisaurus were transported to Isla Nublar for Jurassic World upon the collapse of Isla Sorna's ecosystem, though by 2018, the species was reported extinct by Claire Dearing's Dinosaur Protection Group.
Mamenchisaurus is a member of the Mamenchisauridae, a family of sauropods unique to Jurassic Asia and also include Omeisaurus. Members of this family are characterised by their longer neck to tail ratio, giving them a strange yet graceful appearance. It is still unsure why these necks grew so long, though the most likely explanation is to reach higher growth and this avoid competition with other herbivores.
Mamenchisaurus was the largest sauropod in China at this time and was relatively widespread, with fossil evidence suggesting it may've also lived in Thailand. In the Dashanpu Formation, Mamenchisaurus lived alongside many species of stegosaurs, such as Chungkingosaurus, Gigantspinosaurus and Tuojiangosaurus, along with the massive theropod Yangchuanosaurus, which would've been the main predator of Mamenchisaurus.
- In reality, it is now believed that Mamenchisaurus had a small club at the end of its tail, similar to that of its relative Shunosaurus. However, as the fossil demonstrating this hadn't been discovered at the time of the production of The Lost World: Jurassic Park, which the game version of the animal is partly based on, the Jurassic World Evolution version of Mamenchisaurus doesn't have this feature.
Mamenchisaurus on Wikipedia