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Australopithecus africanus

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Australopithecus africanus was an extinct species of early hominin.

Africanus south africa
Africanus south africa

These ancestors lived in South Africa between 3.3 and 2.1 million years ago. This time period covers the Late Pliocene to the Early Pleistocene. They are incredibly important to science because they provided evidence for human evolution in Africa. Many fossils have been recovered from sites like Taung, Sterkfontein, Makapansgat, and Gladysvale.

Taung1
Taung1

These remains help us understand the transition from ape-like ancestors to the human lineage.

The physical makeup of A. africanus shows a mix of different traits. They were competent bipeds, which means they could walk on two legs.

Australopithecus africanus pelvis and vertebrae at AMNH
Australopithecus africanus pelvis and vertebrae at AMNH

However, they were less efficient at walking than modern humans. Their upper bodies possessed several traits common to arboreal non-human apes. This suggests they may have lived partially or fully in trees. It could also be a vestige, or a leftover trait, from an older ancestor. Their brain volume averaged about 450 cubic centimeters.

Mrs Ples Face
Mrs Ples Face

This is much smaller than a modern human brain. Their cheek teeth were enlarged and featured thick enamel. This helped them process a wide variety of foods.

Dietary habits for this species were very flexible. They were generalists, meaning they could eat many different things. They exploited C4 foods like grasses, seeds, and rhizomes. They might also have eaten underground storage organs or creatures higher up the food chain. During lean times, they may have eaten harder, lower-quality foods like nuts. To survive these tough periods, children may have needed nursing until they were 4 to 5 years old. This suggests a complex way of caring for young ones. Their environment consisted of gallery forests surrounded by open grasslands or bushlands.

The discovery of A. africanus changed how we see history. In 1924, anatomist Raymond Dart described the Taung child fossil.

Australopithecus africanus - Cast of taung child
Australopithecus africanus - Cast of taung child

This was the first early hominin ever discovered. Dart noticed the specimen had a small brain but was bipedal. This was a major discovery because it linked apes and humans. However, many scientists initially rejected his ideas. They believed humans evolved outside of Africa. Some thought the Taung child's human-like traits were just because it was a juvenile. It took until the middle of the 20th century for his findings to be widely accepted.

Other scientists helped build the evidence for this species. Robert Broom was a key figure in this research. In 1936, he found an adult skull at the Sterkfontein quarries.

Australopithecus africanus StS-5 IMG 5617 BMNH
Australopithecus africanus StS-5 IMG 5617 BMNH

This specimen is often called "Mrs. Ples." Broom also discovered the robust australopithecine, Paranthropus robustus. By 1946, research by Broom, Gerrit Willem Hendrik Schepers, and Wilfrid Le Gros Clark turned scientific opinion around. This helped prove that A. africanus was indeed a human ancestor. Later, the discovery that the Piltdown Man was a hoax in 1953 helped confirm the African origins of humanity.

One of the most remarkable finds is a skeleton known as "Little Foot."

Sterkfontein Caves 8
Sterkfontein Caves 8

This specimen is the most completely preserved early hominin ever found. About 90% of its skeleton is intact. There is some debate about its classification. Some suggest it is A. africanus, while others call it A. prometheus. Recent studies have dated parts of these remains to 3.67 million years ago. This makes it one of the oldest specimens from South Africa. These fossils show us how much these early creatures changed over millions of years.

Today, scientists still study how A. africanus relates to other groups. It is unclear if they are ancestral to the genus Homo or to Paranthropus. Some researchers think they might be related to A. sediba. The classification of australopithecines is currently considered a "grade taxon." This means they are grouped by similar physical traits rather than direct family links. The species likely went extinct due to major climatic changes. They may have also faced competition from other groups like Homo and Paranthropus. Understanding them helps us piece together the very beginning of the human story.

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🖼️ Images & Media (7)
File:Australopithecus africanus - Cast of taung child.jpg
Australopithecus africanus - Cast of...
File:Mrs Ples Face.jpg
Mrs Ples Face.jpg
File:Africanus south africa.jpg
Africanus south africa.jpg
File:Australopithecus africanus StS-5 IMG 5617 BMNH.jpg
Australopithecus africanus StS-5 IMG 5617 BMNH.jpg
File:Sterkfontein Caves 8.jpg
Sterkfontein Caves 8.jpg
File:Australopithecus africanus pelvis and vertebrae at AMNH.jpg
Australopithecus africanus pelvis and...
File:Taung1.jpg
Taung1.jpg
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