09/09/2015 Haplorhini

09/09/2015 Haplorhini - Y-5 molar pattern Cercopithecinae...

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Haplorhini Lecture 09/09/2015 Platyrrhine (new world monkeys) → spider monkey, uakari, capuchin cebus, titi monkey, owl monkey flat nose nostrils face out three premolars minimal sexual dimorphism (female & male same size) dental formula mostly 2133 some have prehensile tails (grasp) diurnal (except owl monkey) Callitrichinae → marmosets, tamarins very small body size dental formula 2132 claws no prehensile tails feed on insects and gums twins Catarrhine dental formula 2123 molar morphology (Y-5 or bilophodonty) Africa + Asia downward facing nostrils nose protrudes highly sexually dimorphic Haplorhin i Tarsiiformes (tarsiers) Platyrrhini (new world monkeys) Catarrhini (old world monkeys + humans) Ceboidea Cercopithecoidea Hominoidea (apes + humans) Atelidae Cebidae Pitheciidae
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Cercopithecoidea (old world monkey) Hominoidea (apes, humans) narrow nose broad nose long, narrow trunk short, wide trunk tails no tails bilophodont molars
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Unformatted text preview: Y-5 molar pattern Cercopithecinae ● diverse diets, but more frugivorous than colobines ● terrestrial + arboreal ● simple stomach ● cheek pouches ● low, rounded molar cusps, large incisors ● arms/legs same length Colobinae ● sexually dimorphic ● more specialized diet = leaves ● specialized guy morphology ● no cheek pouches ● sharp molar/shearing crests, small incisors ● long legs Hominoidea ● dental formula 2123 ● no tails ● Y-5 molars ● highly sexually dimorphic (except Hylobtidae) ● Africa + Asia Hylobatidae (lesser apes) ● monogamous ● no sexual dimorphism ● smallest of the hominoids ● feed on fruits, defend territories ● arboreal, brachiation Great Apes ● sexually dimorphic ● diverse social group ● complex social interactions ● cognitively complex ● Asia: orangutans ● Africa: chimpanzees, baboons, gorillas...
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