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''Struthio'' is a genus of bird in the order Struthioniformes. ==Species== There are ten known species from this genus, of which eight are extinct. There are five more possible species of which trace fossils have been found. They are: * †''Struthio coppensi'' (Early Miocene of Elizabethfeld, Namibia) * †''Struthio linxiaensis'' (Liushu Late Miocene of Yangwapuzijifang, China) * †''Struthio orlovi'' (Late Miocene of Moldavia) * †''Struthio karingarabensis'' (Late Miocene - Early Pliocene of SW and CE Africa) - oospecies(?) * †''Struthio kakesiensis'' (Laetolil Early Pliocene of Laetoli, Tanzania) - oospecies * †''Struthio wimani'' (Early Pliocene of China and Mongolia) * †''Struthio daberasensis'' (Early - Middle Pliocene of Namibia) - oospecies * †''Struthio brachydactylus'' (Pliocene of Ukraine) * †''Struthio chersonensis'' (Pliocene of SE Europe to WC Asia) - oospecies * †''Struthio asiaticus'', Asian ostrich (Early Pliocene - Late Pleistocene of Central Asia to China ?and Morocco) * †''Struthio dmanisensis'', giant ostrich (Late Pliocene/Early Pleistocene of Dmanisi, Georgia) * †''Struthio oldawayi'' (Early Pleistocene of Tanzania) - probably subspecies of ''S. camelus'' * †''Struthio anderssoni'' - in N China/Mongolia〔J. G. Andersson, Essays on the cenozoic of northern China. ''Memoirs of the Geological Survey of China (Peking)'', Series A, No. 3 (1923), pp. 1-152, especially pp. 53-77: "On the occurrence of fossil remains of Struthionidae in China."; and J. G. Andersson, Research into the prehistory of the Chinese. Bulletin of the Museum of Far Eastern Antiquities 15 (1943), 1-300, plus 200 plates.〕 oospecies(?) * ''Struthio camelus'', common ostrich * ''Struthio molybdophanes'', Somali ostrich Fossil records and egg shell fragments show that the ancestors of this genus originated about 40-58 million years ago (mya) in the Asiatic steppes as small flightless birds. The earliest fossils from this genus are from the early Miocene (20-25mya), and are from Africa, so it is proposed that they originated there. Then by the middle to late Miocene (5-13mya) they had spread to Eurasia.〔Hou, L. et al. (2005)〕 By about 12 mya they had evolved into the larger size of which we are familiar. By this time they had spread to Mongolia and, later, South Africa.〔Davies, S.J.J.F. (2003)〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Struthio」の詳細全文を読む スポンサード リンク
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