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Hypsibema missouriensis
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''Hypsibema missouriensis'' (pronounced ; originally ''Neosaurus missouriensis'', first renamed to ''Parrosaurus missouriensis'',〔〔 also spelled ''Hypsibema missouriense'') is a species of plant-eating dinosaur in the genus ''Hypsibema'', and the state dinosaur of the U.S. state Missouri.〔 One of the few official state dinosaurs, bones of the species were discovered in 1942, at what later became known as the Chronister Dinosaur Site near Glen Allen, Missouri. The remains of ''Hypsibema missouriensis'' at the site, which marked the first known discovery of dinosaur remains in Missouri, are the only ones to have ever been found. Although first thought to be a sauropod, later study determined that it was a hadrosaur, or "duck-billed" dinosaur, whose snouts bear likeness to ducks' bills.〔 Some of the species' bones found at the Chronister Dinosaur Site are housed in Washington, D.C.'s Smithsonian Institution.〔
==Characteristics==
The species is estimated to have had around 1,000 small teeth,〔〔 weighed (or around as much as an elephant today), stood tall at its back, and stretched about from head to tail.〔 ''H. missouriensis'' lived in what is now southeast Missouri during the Campanian age〔 of the Late Cretaceous period. It was not a carnivorous species, its teeth were more serrated than other hadrosaurs, an indicator that the vegetation of Missouri at the time was very coarse or tough.〔
Paleontologist Charles Whitney Gilmore and geologist Dan R. Stewart described the caudal vertebrae retrieved from Missouri in a 1945 ''Journal of Paleontology'' report, writing, "Caudal vertebrae amphicoelus; centra longer than wide; ends having concave central areas decorated with radiating ridges and depressions surrounded by a flattened peripheral border; chevron facets only on posterior ends." Of the thirteen adult tail bones, twelve appeared to be consecutive, and the smallest centrum was long.〔
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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