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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク List of transitional fossils ： ウィキペディア英語版 List of transitional fossils This is a tentative partial list of transitional fossils (fossil remains of groups that exhibits both "primitive" and derived traits). The fossils are listed in series, showing the transition from one group to another, representing significant steps in the evolution of major features in various lineages. These changes often represent major changes in morphology and anatomy, related to mode of life, like the acquisition of feathered wings for an aerial lifestyle in birds, or limbs in the fish/tetrapod transition onto land. Almost all of the transitional forms in this list do not actually represent ancestors of any living group or other transitional forms. Darwin noted that transitional forms could be considered common ancestors, direct ancestors or collateral ancestors of living or extinct groups, but believed that finding actual common or direct ancestors linking different groups was unlikely.〔Stauffer, RC (1975) Charles Darwin's Natural Selection; being the second part of his big species book written from 1856 to 1858. Cambridge: Cambridge University Press. p. 236.〕〔Darwin, C. R. 1859. On the origin of species by means of natural selection, or the preservation of favoured races in the struggle for life. London: John Murray. p. 187.〕 Collateral ancestors are relatives like cousins in genealogies in which they are not in your direct line of decent but do share a common ancestor (in this case it is a grandparent). This kind of thinking can be extended to groups of life. For instance, the well-known ''Archaeopteryx'' is a transitional form between non-avian dinosaurs and birds, but it is not the most recent common ancestor of all birds nor is it a direct ancestor of any species of bird alive today. Rather, it is considered an extinct close evolutionary "cousin" to the direct ancestors. This may not always be the case, though, as some fossil species are proposed to be directly ancestral to others, like how ''Australopithecus anamensis'' is most likely to be ancestral to ''Australopithecus afarensis''.〔Delezene, LK and Kimbel, WH (2011) Evolution of the mandibular third premolar crown in early Australopithecus. Journal of Human Evolution 60: 711-730.〕 ==Nautiloids to ammonoids== 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「List of transitional fossils」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.