Early Hominids

Early Hominids - Early Hominids Skeletons Comparison of...

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Early Hominids Early Hominids
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Skeletons Comparison of human and chimpanzee skeletons.
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Pelves A comparison of human and chimpanzee pelves.
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Dentition Comparison of dentition in ape, human, and A. afarensis palates.
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Crania Comparison
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The First Hominid? Sahelanthropus tchadensis Found in the Sahel region, Chad 7 to 6 mya Mosaic of features Brain size is more apelike—320-380 cc—widely spaced eye orbits Small canines of hominid shape and wear Face that doesn’t stick out Continuous brow ridge Forward placement of foramen magnum suggests possibility of bipedalism Close to the split between chimps and Homo Others claim it was not bipedal and it was an ape
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The First Hominid? Orrorin tugensis Tugen Hills of northwest Kenya Femurs, teeth, portions of mandible 6.2-5.6 mya “The real ancestor to Homo See Ardipithecus as a chimp, and Australopithecines dead end offshoot Bipedal and had traits considered more “modern” than later Hominids Some question this interpretation, as well as designation as Hominid
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The First Hominid? Ardipithecus kadabba Same Ethiopian location as A. ramidus 5.8-5.2 mya Mandible, teeth, partial clavicle, hand bones, toe Evidence of habitual bipedalism in toe Originally classified with ramidus , but later argued new species
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Ardipithecus ramidus First definitive hominid 4.4 mya Discovered in 1992 by Tim White in Aramis, Ethiopia Distinct suite of traits generalized dentition, diverse vegetarian diet Primitive bipedal locomotion Grasping big toe Cranial capacity smaller than A., ca. 300-350cc Woodland habitat
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Ardipithecus ramidus Not a knuckle walker Foot designed for both walking upright and climbing Indicate ape locomotion and morphology evolved after the split
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Early Hominids - Early Hominids Skeletons Comparison of...

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