Plesiomorphy vs. Apomorphy

Plesiomorphy vs. Apomorphy — Is There a Difference?
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Difference Between Plesiomorphy and Apomorphy

Plesiomorphynoun

(cladistics) A character state that is present in both outgroups and in the ancestors

Apomorphynoun

(systematics) A derived characteristic of a clade. Any feature novel to a species and its descendants.