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Variation in cusp number among mammalian bunodont teeth: (a) 2-cusped slow loris (Nycticebus coucang) premolar, (b) 3-cusped sea otter (Enhydra lutris) molar, (c) 4-cusped human (Homo sapiens) molar, (d) 5-cusped gibbon (Hylobates lar) molar, (e) 6-cusped human molar. Blue dots highlight location of cusp apices. (Online version in colour.)
