ARCH 344 Lecture 8: 344 - lec 8
2 Mar 2017
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Document Summary
Semi-brachiators: hand-over-hand locomotion, arms swing, body suspended (started out as) feeding adaptation. = grasping tails: trend towards short trunks and long limbs, especially arms, adaptation of hand morphology. Fingers get longer (to lengthen palm and lengthen finger) Thumb disappears or placed across palm or reduced (through evolutionary time) Howler monkeys: widest distribution of all platyrrhines, brachiator physiology, quadruped behavior, grasping axis is between 2nd and 3rd finger, body robust, fur dense, colors vary widely among species and sexes. Inflated hyoid bone in throat, thin and hollow, resonates calls: chin angle expanded, mostly males call, morning calling, deli(cid:374)eates (cid:862)auditory territory(cid:863, little physical confrontation, much of cranial anatomy supports voicebox. Woolly monkey: restricted to amazon basin, chunky monkey! Robust body, woolly pelage, thick powerful tail: group side: 15-50 individuals, vegetarian: fruit and leaf eaters, fe(cid:373)ales ha(cid:448)e e(cid:374)larged . Slender limbs, arms > legs: most effective nw brachiator, evolution of hook grips.
