ANTH 201 Lecture Notes - Lecture 18: Shoulder Girdle, Hylobates, Siamang
4 Dec 2017
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Document Summary
The brachiating gibbon: the sequence of arm-swinging is somewhat analogous to the sequence of striping in bipedalism. Body undergoes 180 rotation to the opposite side at each swing of alternating handholds. Kinetic energy is lost during the upswing, compensated for by adjusting the centre of gravity of the body mass up flexion of the legs. Crosses gaps by ricochet arm swinging in which the animal throws itself from branch to branch. Not suitable for quadrapedalism, can only walk bipedally for only a few steps. Smallest of the apes, this group contains one genus or two, depending upon what taxonomist you follow: gibbons (5 to 8 kg). and siamangs (10 to 12 kg). The one genus and at least nine species perspective: hoolock, moloch, lar, agilis, muelleri, concolor, klossii, pileatus, syndactylus. Eight hylobates (napier napier say six species and one siamang). Gibbons and siamangs are distinct in their locomotor patterns they are the only true brachiators.
