Apomorphy vs. Plesiomorphy
Apomorphynoun
(systematics) A derived characteristic of a clade. Any feature novel to a species and its descendants.
Apomorphynoun
An apomorphous character.
Plesiomorphynoun
(cladistics) A character state that is present in both outgroups and in the ancestors
Plesiomorphynoun
The state of being plesiomorphic; ancestral or primitive condition as compared to a later, derived character state. Also (as a count noun): an ancestral or plesiomorphic feature or trait.
