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单词 symplesiomorphy
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Examples ofsymplesiomorphy

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Their similarity to other ground-dwelling birds such as partridges and megapodes is a result of convergence andsymplesiomorphyrather than shared evolutionary innovations.
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When two or more taxa that are not nested within each other share a plesiomorphy, it is asymplesiomorphy(from "syn-", together).
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Later it was realized that the common ancestors of all spiders had these features (a state known assymplesiomorphy).
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For example, the prominent discipline of cladistics uses terms such assymplesiomorphyand synapomorphy for particular aspects of basal and derived attributes.
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However, unlike shared innovations (or "synapomorphies"), the common retention of archaisms (or "symplesiomorphy") is not necessarily considered evidence of a period of common isolated development.
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The concept of thesymplesiomorphyshows the danger of grouping species together purely on the basis of morphologic or genetic similarity without distinguishing primitive from derived traits.
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A commonly cited reason is that distances are inherently phenetic rather than phylogenetic, in that they do not distinguish between ancestral similarity (symplesiomorphy) and derived similarity (synapomorphy).
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These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors.

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更新时间:2025/2/10 22:24:42