そせんけいしつきょうゆう 祖先形質共有 LinksSentence search for 祖先形質共有Sentence search for そせんけいしつきょうゆうKanji details for 祖, 先, 形, 質, 共 and 有Edit in JMdict Noun1. symplesiomorphy; ancestral trait shared by two or more taxa Discussions Log in to talk about this word.