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gel_lec_23 - What monkeys are not quite apes New World...

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Lecture 23 – 3/8/10 Primates What are the close “relatives” of primates? Tree shrews, rodents, rabbits Eye socket incomplete in most mammals, but not for humans or tree shrews, slow loris, gibbon What primates are not quite true primates? Primates but not euprimates: PLESIADAPIFORMS Monkeys: anthropods Apes: hominoids Plesiadapiform - Skulls similar to rodent skulls - Diastema – gap in tooth growth, like rodents - Squirrel size Adapiform - A lot more like primate, included within euprimates What true primates are not quite monkeys? Prosimians - Paraphyletic group - Combination of living and fossil groups (adapiforms) - Lemurs: only found in Madagascar; most common is ringtail; have night-dwellers; almost no fossil record of lemurs - Slow Loris, galagos, bush babies, tarsiers
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Unformatted text preview: What monkeys are not quite apes? New World monkey – more basal; suddenly appear in So. America around the same time as rodents; have a longer skull and tail like a fifth leg; pygmy marmoset Old World monkey – remained in Africa; baboons, colobuses, macaques What apes are not quite hominids? Apes initially designed for tree dwelling; appear in Oligocene, around time New World monkey crossed ocean to So. America; closest living thing to proconsul are gibbons, the only lesser ape we have today. Orangutans most basal of great apes How did primates disperse and when? Eocene – dispersion bigger; reached northward (Primates are typically warm-climate animals, life depends on tree species so distribution is limited)...
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