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Opisthocoelicaudia (meaning “Posterior Cavity Tail”) is a genus of titanosauridae from the Late Cretaceous of Mongolia. When it was described in 1977 by Borusk-Białynicka, it was seen as a new kind of macronaria (camarosaurid) sauropod. Later, in 1993, an experiment conducted by Salgado and Coria confirmed that Opisthocoelicaudia was a titanosaurid. It was a relatively small sauropod, at only 12 metres (39 feet) in length. For it’s body mass, several experiments concluded with different results, with the results being 8.4, 10.5, and 13 tons. Borusk-Białynicka’s specimen was missing it’s neck and head, apparently eaten by tyrannosaurids. This tyrannosaurids theory originated from the fact that teeth marks were discovered near the pelvis and femur. Most exerts beleive that the tyrannosaurid is not new, and most likely a Tarbosaurus, Zhuchengtyrannus, or Alectrosaurus. The head and neck were never recovered. Borusk-Białynicka named the type species (and only species) O.skarzynskii. Being from the Nemegt-Formation, it was once thought that it was a possible synonym of Nemegtosaurus. Nemegtosaurus is known only from a skull and Opisthocoelicaudia is missing it’s skull and neck. Due to this reason, scientists thought they were the same species. A recent study proved that both Opisthocoelicaudia and Nemegtosaurus are valid.

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