Anthro2050 1st Edition Lecture 27Outline of Last LectureI. Intro to AustralopithecinesII. Gracile Australopithecines Outline of Current Lecture I. Gracile Australopithecines ContinuedII. Robust AustralopithecinesCurrent LectureGracile 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. Uniquefeatures 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
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