Australopithecus afarensis Afarensis had a more adapted eating features than Ardipitecus Ramidus. His jaw and teeth were bigger as well as the chewing muscle. The male was also a little taller and heavier than the female probably caused by the different activities they had endure on the plains. He had a bigger brain that improved social interactions. Remains have been dated to be 3.9 and 3.0 million years old. He still had many ape features such as the teeth and bones that were physically very strong.
Australopithecus africanus The people were tough, hard-working and resilient. Man had joined the other plains' animals in a balance with nature that appeared stable. Something had happened to upset this balance causing them to disappear. Remains date between 3 and 2 million years ago. He was bipedal, and was bigger than his predecessor. Brain size was larger: between 420 and 500 cc. but still not advanced in the areas necessary for speech. The back teeth were a little bigger than in afarensis. His jaw and eating muscles were even more human-like of the humans than apes. there is no solid theory of what caused his extinction. With their stronger culture, they could survive the plains better than the other herd herbivores. Their population grew. Competition was high for food. Other species branched off: Australopithecus aethipicus came first, followed by robustus and boisei. These were bigger and tougher competitors for the same food supply
Australopithecus robustus
Robustus had almost the same physical features , but a bigger skull without forehead and large brow ridges with a large teeth. He had sagital crests with big jaw muscles attached and a flat face. Some bones have been found and they are supposed to be digging tools
Australopithecus boisei
The only difference between robustus and boisesi is that boisei had a tougher skull. He is believed to be a variant from the same species of robustus, but never believed as a human antecessor.
Homo habilis
Homo habilis was the transition man. Starting with a 500cc brain, it grew to a respectable 800cc. Habilis developed from a brutish and dim-witted herd animal to a competent man. The Broca's area in his brain became developed showing the existence of a workable vocabulary. He invented the use of fire for cooking, warmth and keeping wild animals at bay. He invented the stone axe. He also may have eliminated the last of that big tough robustus and boisei bunch. For some reason they disappeared about that time.
Homo erectus
Homo erectus existed between 1.8 million and 300,000 years ago. Like habilis, he had very primitive face with pronunciated jaw and big grinding teeth with a brain ranging from 750 to 1225 cc. The skeleton shows greater physical strength than modern humans. Homo habilis and all the australopithecines are found only in Africa, but erectus has been found in Africa, Asia, and Europe. There is evidence that , and their stpne tools are better-made than those of habilis.
Homo antecessor
Homo antecessor is the oldest European hominids that have been found so far dating to be at least 780,000 years ago. His face looks very modern but still has some very primitive features such as the brow ridges and some teeth.
Homo sapiens (archaic)
Archaic forms of Homo sapiens first appear about 500,000 years ago. Homo sapiens archaic has many features of modern humans and homo erectus. Brain size is smaller than modern humans and bigger than erectus, the skull is more rounded than erectus skull. Many still have large brow ridges and flatter faces than modern humans.
Homo sapiens Neanderthalensis
Neandertal man existed between 230,000 and 30,000 years ago. His brain size was a little bigger than modern humans (about 1450 cc). His face shows some adaptation to cold as well as his body. They were short and solid, with short limbs. Men averaged about 168 cm (5'6") in height. Their bones are thick and heavy, and show signs of great physical strength. Their skeletons also show the hard lives they endured in cold climates. It is known that they buried their death and to be good hunters.
Homo sapiens sapiens (modern)
Modern forms of Homo sapiens first appear about 120,000 years ago. Modern humans have an average brain size of about 1350 cc. he developed the first form of art such as music and painting. Physical features are more adapted to actual climate and the skeleton is more agile. Homos sapiens sapiens has body more adapted to run, hence the larger buttocks to balance the body while running and the larger pulmonary capacity with a more efficient cardiovascular system.
http://www.talkorigins.org/faqs/homs/
Conrad Phillip Kottak. Anthropology.