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ANT154A 09BW - Anthropology 154A Lecture 9 Colobinae The...

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1 Anthropology 154A Lecture 9 The Haplorhini: Infraorder Catarrhini Superfamily Hominoidea The Apes Phylogeny of the Catarrhini Colobinae Cercopithecinae Turn to the Hominoidea Infraorder Catarrhini Superfamily Cercopithecoidea Family Cercopithecidae Subfamily Cercopithecinae Subfamily Colobinae Superfamily Hominoidea – Family Hylobatidae – Family Pongidae – Family Hominidae Sectorial lower first premolar Anterior honing surface, which sharpens the posterior edge of the upper canine-- as a whetstone is used to sharpen the edge of a knife BIG gap (diastema) where the long lower canine fits as the jaws close CATARRHINI: Anterior dentition CATARRHINI Cercopithecoidea Bilophodont molars M D L B
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2 CATARRHINI Hominoidea “Y-5” molars M D L B Infraorder Catarrhini Superfamily Hominoidea Primitive molar form (“Y-5”) Brachiating shoulders Intermembral index > 100 Shortened lower back with reduced number of lumbar vertebrae High joint mobility No external tails Folivorous or frugivorous (omnivorous) Hominoidea: Longer arms than legs, except in humans This is related to the capacity for “forelimb suspension” used to brachiate, and to feed while hanging in tree canopies Scapula Scapula Trunks of the bodies of (a) Cercopithecoid (b) Pongo (c) Pan (d) Gorilla Note the shorter lumbar segment of the vertebral column of the Hominoidea Cranial view of the thorax of a cercopithecoid (above) and a hominoid. Note the narrow ribcage of the monkey, wide ribcage of the ape, and the position of the scapula in each case Hominoid Cercopithecoid
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