different between plesiomorphic vs symplesiomorphy

English

plesiomorph +? -ic

plesiomorphic (comparative more plesiomorphic, superlative most plesiomorphic)

(cladistics) Sharing a character state with an ancestral clade; primitive.
- 2000, Christine A. Nalepa and Claudio Bandi,"Paedomorphosis and Termite Evolution," in Termites: Evolution, Sociality, Symbioses, Ecology [1], ?ISBN, page 68:
  [T]he cockroach Polyphaga may represent a condition more plesiomorphic than in other Dictyoptera, but it could as well be paedomorphic, and therefore more derived than in other Dictyoptera [72].
plesiomorphous

symplesiomorphy (plural symplesiomorphies)

(cladistics) An ancestral trait shared by two or more taxa.
Coordinate term: synapomorphy

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