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Azhdarchidae
Azhdarchidae (from ''اژدرها (Aždarha)'', the Persian word for dragon) is a family of pterosaurs known primarily from the late Cretaceous Period, though an isolated vertebra apparently from an azhdarchid is known from the early Cretaceous as well (late Berriasian age, about 140Ma ago).〔Dyke, G., Benton, M., Posmosanu, E. and Naish, D. (2010). "Early Cretaceous (Berriasian) birds and pterosaurs from the Cornet bauxite mine, Romania." ''Palaeontology'', published online before print 15 September 2010. 〕 Azhdarchids included some of the largest known flying animals of all time. Originally considered a sub-family of Pteranodontidae, Nesov (1984) named the azhdarchinae to include the pterosaurs ''Azhdarcho'', ''Quetzalcoatlus'', and "Titanopteryx" (now known as ''Arambourgiania''). They were among the last known surviving members of the pterosaurs, and were a rather successful group with a worldwide distribution. By the time of the end-Cretaceous mass extinction, most pterosaur families except for the Azhdarchidae disappear from the fossil reccord, but recent studies indicate a wealth in pterosaurian faunas, including pteranodontids, nyctosaurids, tapejarids and several indeterminate forms. Some taxa like ''Navajodactylus'', ''Bakonydraco'' and ''Montanazhdarcho'' were moved from Azhdarchidae to other clades.〔Carroll, N. REASSIGNMENT OF MONTANAZHDARCHO MINOR AS A NON-AZHDARCHID MEMBER OF THE AZHDARCHOIDEA, SVP 2015〕
==Description==
Azhdarchids are characterized by their long legs and extremely long necks, made up of elongated neck vertebrae which are round in cross section. Most species of azhdarchids are still known mainly from their distinctive neck bones and not much else. The few azhdarchids that are known from reasonably good skeletons include ''Zhejiangopterus'' and ''Quetzalcoatlus''. Azhdarchids are also distinguished by their relatively large heads and long, spear-like jaws. It had been suggested azhdarchids were skimmers, but further research has cast doubt on this idea, demonstrating that azhdarchids lacked the necessary adaptations for a skim-feeding lifestyle, and that they may have led a more terrestrial existence similar to modern storks and ground hornbills.〔(【引用サイトリンク】title=Pterosaurs )〕
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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