gel_lec_24 - -Canines: canines smaller and diamond shaped,...

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Lecture 24 – 3/10/10 Hominids How do we define the Hominidae? “Homininae”: Chimpanzee  Human What are the oldest hominids? - Lucy and the First Family: australopitihecus afarensis, 3.2 Ma (3 to 3.8 Ma) - Anamensis: 4 ma (Pliocene) - Ardipithecus ramidus: 4.4 ma (Pliocene) - Ardipithecus kadabba: 5.3-5.8 Ma (Miocene) - Orrorin: 6 Ma (Miocene) - Sahelanthropus: 7 Ma (Miocene) What features do hominids share? - Bipedalism: early on, thigh bones faced straight down; deeper inclination means probably b adapted for bipedalism; hip shape changed - Smaller big toe (transitional form – Ardi: bipedal, but had monkey like big toe)
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Unformatted text preview: -Canines: canines smaller and diamond shaped, compared to chimpanzees huge canines How many hominid species have there been? Miocene 1 to 3 Pliocene ardipithecus: 2-4; Australopithecus 2-6; paranthropus: 1-3; homo: 4-13 (25-30 species; if a minimalist, 12) What are the major features in hominid evolution?-Body size: gradually became larger-Skull size: gradually became larger-Hip bone: hole becomes larger to accommodate pushing out a big-headed baby-Artificially modified tools (?): australopitihecus 2.5 Ma...
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This note was uploaded on 08/30/2011 for the course GEL 3 taught by Professor Motani,r during the Spring '08 term at UC Davis.

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