A shared ancestral character is "a character that originated in an ancestor of the taxon."
The species ancestral to more than one group shares a trait that can cause various groupings to be grouped together in classification. The only accurate method of determining phylogeny is by the use of shared derived characters, which are shared by the ancestral species and a single group.
Plesiomorphy (plesiomorphic character) is the name for a primitive or ancestral character state, while symplesiomorphy is the name for a shared plesiomorphy. For instance, hair is a distinctive feature of mammals that developed together with mammals.
Qualities that are derived from ancestors. There are commonalities among the bigger group's ancestors. A smaller number of people only exhibit derived features. Having the derived trait identifies and defines the smaller group.
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