最古の人類はどのような姿をしていたのか。この問いに迫る最適な証拠がこのたび得られた。アルディピテクス・ラミドゥス（Ardipithecus ramidus）のほぼ全身にわたる骨格が見つかったのである。“アルディ”と名付けられたこの骨格の持ち主は生存時、身長 ...

The oldest distinguishing feature between humans and our ape cousins is our ability to walk on two legs—a trait known as bipedalism. Among mammals, only humans and our ancestors perform this atypical ...

440万年前に生息していたとみられるアルディピテクス・ラミドゥス（Ardipithecus ramidus）、通称ラミドゥス猿人の犬歯をデジタル処理した復元図（中央）。この犬歯は男性（オス）のもので、大きさはヒトの犬歯（左）とチンパンジーの犬歯（右）の中間 ...

Ardi, short for Ardipithecus ramidus, is now the region’s best-known fossil, having made news worldwide this past fall when White and others published a series of papers detailing her skeleton and ...

A meticulous study of the ankle joint of this 4.4-million-year-old ancestor positions this species as a crucial link, bearing both primitive traits for climbing and early adaptations for upright ...

Explore how Ardipithecus ramidus reshapes our understanding of human evolution and the misleading nature of extant apes as analogs. In retrospect, clues to this vast divide between the evolutionary ...