An Australopithecus africanus tooth

A tooth of Australopithecus africanus catalogued by the Transvaal Museum as STS 1881. The specimen is 15.46 × 13.64 × 7.31 mm in size. STS 1881 was discovered near Sterkfontein, South Africa and dates back 2.8 million years.
Photo credit: Didier Descouens