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Unformatted text preview: 4-15-08Miocene: 23 to 5 myaFirst hominoidsFirst hominidsGeographical distribution of Miocene hominoids:Earliest apes- exclusively in East AfricaArabian plate separation provided land corridor, when apes moved to EuropeTethis sea was migratorial barrier to some speciesApes in Southeast Asia only in terminal partProconsul: genus of earliest apeY-5 cusp pattern (only thing that definitively suggests hominoid)Diversity in postcranial anatomy:Quadrupedal (most) or arborealSivapithecus:ancestor of orangutansGSP 15000 PanGSP 15000PongoGSP- Geological Survey of PakistanIs dated 12-8 million years ago (the species)Suggested that orangutan diverged from ape lineageGSP and Pongo is more oval in shape than PanImplantation of roots of incisor teeth in maxillaShape of superprbital torch (straight strut of bone for Pan, not so with Pongo or GSP which follow outline of orbit)Narrow distance between orbits and shape is oval for GSP (similar to orangutan)Note the:Distance between orbits in orangutan and chimpGigantopithecus...
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- Spring '07