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Tiktaalik
''Tiktaalik'' is a monospecific genus of extinct sarcopterygian (lobe-finned fish) from the late Devonian period, about 375 Mya , having many features akin to those of tetrapods (four-legged animals). ''Tiktaalik'' has a possibility of being a representative of the evolutionary transition from fish to amphibians. It is an example from several lines of ancient sarcopterygian fish developing adaptations to the oxygen-poor shallow-water habitats of its time, environmental conditions which led to the evolution of tetrapods.〔Jennifer A. Clack, ''Scientific American'', (''Getting a Leg Up on Land'' ) Nov. 21, 2005.〕 It and similar animals may possibly be the common ancestors of the broad swath of all terrestrial fauna: amphibians, reptiles, birds, and mammals. The first well-preserved ''Tiktaalik'' fossils were found in 2004 on Ellesmere Island in Nunavut, Canada.
==Etymology==
The name ''Tiktaalik'' is an Inuktitut word meaning "burbot", a freshwater fish related to true cod.〔(Nunavut Living Dictionary ). Entry for (''tiktaalik'' )〕 The "fishapod" genus received this name after a suggestion by Inuit elders of Canada's Nunavut Territory, where the fossil was discovered. The specific name ''roseae'' cryptically honours an anonymous donor. Taking a detailed look at the internal head skeleton of ''Tiktaalik roseae'', in the October 16, 2008, issue of ''Nature'', researchers show how ''Tiktaalik'' was gaining structures that could allow it to support itself on solid ground and breathe air, a key intermediate step in the transformation of the skull that accompanied the shift to life on land by our distant ancestors.〔("Fishapod" Reveals Origins of Head and Neck Structures of First Land Animals ) Newswise, Retrieved on October 15, 2008.〕
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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