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Geosternbergia
''Geosternbergia'' is an extinct pteranodontid reptile from the Late Cretaceous geological period of North America. It was one of the largest pterosaur genera and had a wingspan of up to .
==Description==
''Geosternbergia'' was among the largest pterosaurs, with the wingspan of most adults ranging between 3 and 6 meters (9.8–19.6 ft). While most specimens are found crushed, enough fossils exist to put together a detailed description of the animal. ''Geosternbergia'' is distinguished from ''Pteranodon'' mainly by its upright-crest. The lower jaw of ''G. sternbergi'' was 1.25 meters (4 ft) long.〔Zimmerman, H., Preiss, B., and Sovak, J. (2001). ''Beyond the Dinosaurs!: sky dragons, sea monsters, mega-mammals, and other prehistoric beasts'', Simon and Schuster. ISBN 0-689-84113-2.〕
The most distinctive characteristic of ''Geosternbergia'' is its cranial crest. These crests consisted of skull bones (frontals) projecting upward and backward from the skull. The size and shape of these crests varied due to a number of factors, including age, gender, and species. Male ''G. sternbergi'', the older species of the two described to date, had a larger vertical crest with a broad forward projection, while ''G. maysei'' had a short, rounded vertical crest and was generally smaller. Females of both species were smaller and bore small, rounded crests.〔 The crests were probably mainly display structures, though they may have had other functions as well.〔
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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