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Olorotitan
''Olorotitan'' was a genus of lambeosaurine duckbilled dinosaur from the middle or latest Maastrichtian-age Late Cretaceous,〔Godefroit, P., Lauters, P., Van Itterbeeck, J., Bolotsky, Y. and Bolotsky, I.Y. (2011). "Recent advances on study of hadrosaurid dinosaurs in Heilongjiang (Amur) River area between China and Russia." ''Global Geology'', 2011(3).〕 whose remains were found in the Tsagayan Formation beds of Kundur, Amur Region, Far Eastern Russia. The type, and only species is ''Olorotitan arharensis'' whose holotype specimen, consisting of a nearly complete skeleton, was described by Pascal Godefroit ''et al.'' in mid-2003. The generic name ''Olorotitan'' means "gigantic swan", while the specific descriptor ''arharensis'' refers to the location of the fossil find at Arhara County. ''Olorotitan'' is distinct from other crested duckbills by its possession of an unusual crest that points backward and takes on a hatchet or fan-like shape. Its discovery has implications for the diversity of lambeosaurine hadrosaurids.
==Description==
''Olorotitan arharensis'' is based on the most complete lambeosaurine skeleton found outside North America to date. It was a large hadrosaurid, comparable to other large lambeosaurines like ''Parasaurolophus cyrtocristatus'', and may have grown up to 12 meters long (39 ft).
It is characterized by numerous unique features for a hadrosaurid, the most obvious being the large hatchet-like hollow crest adorning its skull. The skull itself is supported by a rather elongated neck, having 18 vertebrae, exceeding the previous hadrosaurid maximum of 15. The sacrum, with 15 or 16 vertebrae, has at least 3 more vertebrae than other hadrosaurids. Further along the vertebral series, in the proximal third of the tail, there are articulations between the tips of the neural spines, making that caudal area particularly rigid; the regularity of these connections suggests that they are not due to a pathology, although more specimens are needed to be certain. Godefroit and his coauthors found through a phylogenetic analysis that it was closest to ''Corythosaurus'' and ''Hypacrosaurus''.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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