noun
symplesiomorphy
Technical term in evolutionary biology for an ancestral trait shared by two or more taxa. Used in cladistics and phylogenetics.
祖先形質共有は、系統解析において重要な概念です。
Symplesiomorphy is an important concept in phylogenetic analysis.
この形質は祖先形質共有であり、派生形質ではありません。
This trait is a symplesiomorphy, not a derived trait.
Synapomorphy: a shared derived trait, as opposed to the ancestral trait (symplesiomorphy).
Compound of 祖先 (ancestor), 形質 (trait, character), and 共有 (sharing). A direct translation of the English biological term 'symplesiomorphy'.