What did robustus evolve?
What did robustus evolve?
P. aethiopicus
robustus evolve from P. aethiopicus, or were there regionally distinct robust australopithecine lineages – meaning P. robustus evolved from the other southern African species Au.
What is the evolutionary trend observed in the australopithecines?
Australopithecus anamensis lived about 4.2 million years ago. More is known about another early species, Australopithecus afarensis, which lived between 3.9 and 2.9 million years ago. This species demonstrates a trend in human evolution: the reduction of the dentition and jaw in size.
Which of the following traits is found in the robust australopithecines?
They are characterized by several features of the skull that give them a “robust” appearance when compared to other, more gracile hominins. The most notable of these features are large, thickly enameled, postcanine teeth that were supported by deep and broad mandibular corpora with tall and broad rami (Fig. 1).
What did australopithecines evolve?
Evolutionary Tree Information: This species may be a direct descendant of Au. anamensis and may be ancestral to later species of Paranthropus, Australopithecus, and Homo.
What do the skull jaws and teeth of australopithecines indicate?
The teeth and skulls of australopithecines suggest that they had a vegetarian diet. The cranial features of Australopithecus afarensis were poorly adapted to chewing, grinding, and crushing. Sexual dimorphism is less pronounced in modern Homo sapiens than in the australopithecines.
What are three anatomical traits that the robust australopithecines have that the gracile forms do not?
Gracile species had pronounced prognathism, less flared cheeks, and smaller cheek teeth, but robust species had very large projecting brow ridges, projecting face, post-orbital restriction, flared cheekbones, large jaws, big molars, and heavy facial muscles.
What is the significant biological characteristics of Australopithecus anamensis?
Overview: Australopithecus anamensis has a combination of traits found in both apes and humans. The upper end of the tibia (shin bone) shows an expanded area of bone and a human-like orientation of the ankle joint, indicative of regular bipedal walking (support of body weight on one leg at the time).
What are some characteristics of Australopithecus?
Australopithecines (plural of Australopithecus) were short and stocky with apelike features such as long arms, thick waistlines and chimpanzee-like faces. They had short and stocky apelike bodies, and brains closer in size to a chimpanzee than a modern human. Males were about 1.37 meters tall and females 1.14 meters.
What features do the Australopithecus species share?
They were similar to modern humans in that they were bipedal (that is, they walked on two legs), but, like apes, they had small brains. Their canine teeth were smaller than those found in apes, and their cheek teeth were larger than those of modern humans.
What does the large size of the robust australopithecine teeth and jaws tell us about their diet quizlet?
They are called robust because of their larger faces and teeth, jaw, chewing muscles. This means they ate harder course foods. They have a similar body size to Gracile.
What are the characteristics of Australopithecus that set it apart from other early peoples?
Australopithecines (plural of Australopithecus) were short and stocky with apelike features such as long arms, thick waistlines and chimpanzee-like faces. They had short and stocky apelike bodies, and brains closer in size to a chimpanzee than a modern human.