Fossil evidence and classification:
In the year 1925 a fossil evidence of a three-year-old organism that had anatomical characteristics similar to humans and apes aged 2-3 MYA were found in South Africa.
They were called the southern apes or â€œLucyâ€.This was the first fossil evidence of the genus Australopithecus, which had a small face and the size of its brain was similar to apes. While its large back teeth and front small canine tooth showed similarities with modern-day humans.
Based on the fossil structure it was also found that they exhibited an upright walking position with two feet. After which various fossil evidence was found in different locations of Africa which gave rise to about eight different species of Australopithecus. They were 1.2-1.5 meters tall.
Anatomy and physiology:
It had a vertical upright skull and spine position. Propulsion of their lower limbs was balanced and effective due to the presence of their broad and short pelvis. They weighed around 30-50 kg. Males were bigger than females.
The early Australopithecus facial features and brain size were similar to the chimpanzee, while their waistline was thick, and arms were long and they looked stocky and short similar to apes. The male’s height about 1.37 meters and the females were 1.14 meters tall approximately.
The extinct African apes due to natural selection, an evolutionary process developed their anatomical and physiological features by adapting to bipedalism, shearing of their premolar and loss of their canine tooth, expansion of their brain, development of stone tools were some of their obtained traits in the process of evolution.
Behavior and evolutionary development:
From the fossil evidence, it was known that their sense of smell was poorly built as their nasal clefts were small. However, they had good eyesight as their eye sockets were well developed.
Similar to gorillas and orangutans they exhibited a sexually dimorphic trait in which the females were short compared to males and maturation in females was stopped once they start breeding.
However, in males maturation and growth rate were massive making them robust and dominant. Their strong muscles and large jaws made them robust in tough food grinding and smashing. As they had short legs with bipedal traits tree climbing was easy. They usually fight for access to females with their aggressive nature and squat physique.
A case of lifestyle adaptations with the no-predetermined the evolutionary process was observed in the Australopithecus to develop the homininâ€™s characteristics. As evolution proceeded more complex tools were produced, more expansion of the brain and reduction of tooth helped the development of the human lineage.
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