Anthro2050 1st Edition Lecture 27 Outline of Last Lecture I Intro to Australopithecines II Gracile Australopithecines Outline of Current Lecture I Gracile Australopithecines Continued II Robust Australopithecines Current Lecture Gracile Australopithecines Continued valgus angle and a wider pelvis indicate bipedality foot has a combination of human like features and ape like features The big toe is like a human s but the phalanges are curved like an ape Laetoli Tanzania A afarensis footprints left in volcanic ash 3 6 million years ago Two sets of foot prints a man and woman most likely with indication of the woman carrying something likely an infant body proportions long arms femur short compared to the humerus high sexual dimorphism 3 1 2 to 5 ft tall 64 99 pounds 1 6 ratio between male and female body size the ratio is 2 for apes and 1 3 for humans Robust Australopithecines large teeth and a heavy built cranium direct offshoot from the gracile australopithecines approximately 2 5 million years ago Unique features that suggest heavy and difficult chewing was needed brain size approximately that of gracile australopithecines clearly bipedal as well long flatter faces with big wide cheek bones These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute sagittal crests of various sizes and strong post orbital constriction really big teeth for chewing and huge heavy mandibles
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