Also called a "missing link." Generally, it refers to a missing part in a complete system. C. Darwin is well known for saying, "A fossil link in the chain connecting man and apes is missing" (The Origin of Man, 1871). German biologist EH Haeckel applied Darwin's evolutionary thinking to the natural classification of organisms, and replaced the horizontal relationship of organisms' affinity with a vertical relationship over time, believing that organisms that are more distantly related to each other diverged in earlier times. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
〈失われた環〉ともいう。一般的には,ある完結する系において欠けている部分をいう。C.ダーウィンが,〈人間とサルとをつなぐ鎖の環となる化石が欠けている〉(《人類の起源》1871)と述べたことでよく知られている。ドイツの生物学者E.H.ヘッケルは,ダーウィンの進化的考え方を生物の自然分類に適用し,いわば横の関係である生物の類縁性の疎密を時間的な縦の関係に置きかえて,たとえば類縁関係の遠い生物どうしほど古い時代に分岐したと考えた。
出典 株式会社平凡社世界大百科事典 第2版について 情報 |
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