Opisthocoelicaudia

Opisthocoelicaudia skarzynskii, meaning "posterior cavity tail," is a titanosaurian sauropod dinosaur from the Late Cretaceous Nemegt formation in Mongolia. Appearing in the Zoo Tycoon 2 video Opisthocoelicaudias, it has the distinguished position of being the first dinosaur ever to feature in a Manatee ZT2 video.

It is a relatively small sauropod, at about 36 ft (11 meters), and was named for its unusual, opisthocoel condition of the anterior tail vertebrae that were concave on their posterior sides. This and several other skeletal features have caused



paleontologists to reach the conclusion it could rear on its hind legs. Opisthocoelicaudia was described in Maria Magdalena Borsuk-Bialynicka in 1977 (while discovered in 1965), and tooth marks on its bones indicate predators scavenged its carcass and carried away the now-missing parts. Two specimens are currently known, including the type



specimen. Opisthocoelicaudia, whose skull is currently unknown, may in fact be a junior synonym of Nemegtosaurus, which is only known from a skull. If this is true, Opisthocoelicaudia would have also appeared in War of the Elands and Jon, the Rampaging Wyvern of Death, but as of now the jury is out.