Symplesiomorphy vs. Plesiomorphy

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

Symplesiomorphynoun

(cladistics) An ancestral trait shared by two or more taxa.

Plesiomorphynoun

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