An autapomorphy in cladistics is a derived trait or apomorphy that is unique to only one terminal group. That is, it is found only in one member of a clade, but not found in any others or outgroup taxa, not even those most closely related to the group (which may be a species, family or in general any clade). An autapomorphy is not present in the closest relative of the terminal group and also was not present in their common ancestor.
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