Not present in the ancestor of a taxon but present in at least some of the descendants. An apomorphic character state. Opposed to plesiomorphic.
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Apomorphic
Cladogram of two genera (blue and red); the red bullets represent apomorphic character states within the red genus. It is important to note that characters 1, 2, and 3 are apomorphic for the taxon comprising both genera, but are plesiomorphic when only the red genus is considered.