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platy-, "flat", and rhin-, "nose") have nostrils which face sideways. The catarrhines (from Ancient Greek katà-, "down", and rhin-, "nose") have nostrils that face downwards. Catarrhines also never have prehensile tails, and have flat fingernails and toenails, a tubular ectotympanic (ear bone), and eight, not 12, premolars, giving them a dental formula of , indicating 2 incisors, 1 canine, 2 premolars, and 3 molars on each side of

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