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Synapomorphy


A synapomorphy is a homologous trait (or traits) shared by two or more taxa which were derived from a common ancestor. In cladistics, synapomorphies are used to establish phylogenies.
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Synapomorphy
Shared derived characters that are regarded as homologous are called synapomorphies, e.g. the presence of mammary glands in all three lineages of mammals (monotremes, marsupials and placentals).
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synapomorphy -- A character which is derived, and because it is shared by the taxa under consideration, is used to infer common ancestry.
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synapomorphy Shared, evolutionarily derived character states that are used to recover patterns of common descent among two or more species.
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A synapomorphy is a technical term that is used when you know that two animals have inherited the same characteristic. First, they have the same characteristic and you know that they inherited it together.
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These identifying characteristics of a clade are called synapomorphies (shared, derived characters). For instance, hardened front wings are a synapomorphy of beetles, while circinate vernation, or the unrolling of new fronds, ...
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