Erketu

Erketu (meaning "Erketü tengri") is a genus of somphospondylan dinosaur that lived in Asia during the Late Cretaceous, roughly between 96 million and 89 million years ago. It is known from the Bayanshiree Formation of Mongolia, and its fossils were found between 2002 and 2003 during field expeditions. Erketu was first described in 2006 and later on in 2010 due to some cervicals that were left behind in the expedition. This genus represents the first sauropod described from the Bayanshiree Formation. The elongated cervical vertebrae indicate that it probably had the longest neck relative to its body size of any sauropod.

==Discovery and naming== The first remains of Erketu were found back in 2002 by the American Museum of Natural History–Mongolian Academy of Sciences expedition conducted in Mongolia. The team discovered the outcrops of the new locality Bor Guvé, which overlies the Khara Kuthul locality and therefore is referable to the Bayan Shireh Formation. The unearthed specimen, IGM 100/1803, was found in exposure at the sediments of Bor Guvé, mainly composed by sandstone and interbedded grey siltstones, suggesting a fluvial environment that is consistent with the Bayan Shireh Formation. Collected elements are mainly represented by cervical vertebrae and postcranial remains, such as the partial right sternum, tibia and fibula with astragalus and calcaneum.