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Cretornis
''Cretornis'' is a pterosaur genus containing the single species ''Cretornis hlavaci''. It is known from a complete three inch long humerus (upper arm bone) and other wing bones found in late Cretaceous period (Turonian) rocks from Czech Republic, dating to about 92 million years ago.〔Averianov, A.O. (2010). "(The osteology of ''Azhdarcho lancicollis'' Nessov, 1984 (Pterosauria, Azhdarchidae) from the Late Cretaceous of Uzbekistan )." ''Proceedings of the Zoological Institute of the Russian Academy of Sciences'', 314(3): 246-317.〕 Based on comparison with its relatives, the wingspan of ''C. hlavaci'' has been estimated at .〔
The specimen was found by the pharmacist Hlaváč at Zářecká Lhota near the town of Choceň in 1880. In 1881, the Czech naturalist Antonín Frič named it as the type species ''Cretornis Hlaváči''. The generic name is derived from Latin ''creta'', "chalk", in reference to the Cretaceous, and Greek ὄρνις, ''ornis'', "bird", as Frič thought the bones belonged to some ancient bird. The specific name honours Hlaváč.〔Fritsch, A., 1880, "Ueber die Entdeckung von Vogelresten in der böhmischen Kreideformation (''Cretornis Hlaváči'')", ''Sitzungsberichte der königlichen-böhmischen Gesellschaft der Wissenschaften in Prag'' 1880: 275-276〕 Afterwards it was realised that the find represented some pterosaur. The name was incorrectly emended by Richard Lydekker into ''Ornithochirus hlavatschi'' in 1888.〔R. Lydekker. 1888. ''Catalogue of the Fossil Reptilia and Amphibia in the British Museum (Natural History). Part I, Containing the Orders Ornithosauria, Crocodilia, Dinosauria, Squamata, Rhynchocephalia, and Proterosauria''. British Museum (Natural History), London 309 pp〕
==Classification==
While it has often been classified as a species in the genus ''Ornithocheirus'', more detailed comparisons of the wing bones showed that they belonged to a non-azhdarchid azhdarchoid, probably a member of the group Neoazhdarchia.〔 It is probably more advanced than the thalassodromids, and shares many features in common with ''Montanazhdarcho''.〔
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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