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This is a partial list of transitional fossils (fossil remains of groups that exhibit 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.

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  • This is a partial list of transitional fossils (fossil remains of groups that exhibit 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. 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. Collateral ancestors are relatives like cousins in genealogies in which they are not in your direct line of descent 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. (en)
  • Esta é uma lista ainda muito provisória de fósseis de transição (restos fósseis de uma criatura que exibe traços primitivos quando comparada com formas de vida com maior derivação com a qual está relacionada). Uma lista ideal apenas incluiria "verdadeiros" fósseis de transição, isto é, formas de vida morfologicamente semelhantes aos ancestrais do grupo monofilético contendo as formas relacionadas dela derivadas, e não formas intermediárias. O artigo sobre fósseis de transição explica a diferença entre estes e as formas intermediárias. Uma vez que todas as espécies estão em transição devido à selecção natural, o próprio termo "fóssil de transição" é na sua essência uma incorrecção. No entanto, os fósseis listados representam passos significativos na evolução das maiores características das várias linhagens de vertebrados, enquadrando-se assim no uso comum do termo. (pt)
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  • This is a partial list of transitional fossils (fossil remains of groups that exhibit 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. (en)
  • Esta é uma lista ainda muito provisória de fósseis de transição (restos fósseis de uma criatura que exibe traços primitivos quando comparada com formas de vida com maior derivação com a qual está relacionada). Uma lista ideal apenas incluiria "verdadeiros" fósseis de transição, isto é, formas de vida morfologicamente semelhantes aos ancestrais do grupo monofilético contendo as formas relacionadas dela derivadas, e não formas intermediárias. O artigo sobre fósseis de transição explica a diferença entre estes e as formas intermediárias. Uma vez que todas as espécies estão em transição devido à selecção natural, o próprio termo "fóssil de transição" é na sua essência uma incorrecção. No entanto, os fósseis listados representam passos significativos na evolução das maiores características das (pt)
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  • Daftar fosil peralihan (in)
  • List of transitional fossils (en)
  • Lista de fósseis de transição (pt)
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