Dictionary of Human Evolution and Biology

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Nasal Septum

Wall that runs vertically through the medial line of the nose and separates the two nasal cavities. This wall is composed of cartilage and bone and joins the vomer anteriorly. In life the nasal septum is covered with mucosa that helps trap particles from the inspired air. Nasalis É. Geoffroy, 1812: monotypic catarrhine genus to which the proboscis monkey belongs. Occupy mangrove forests on Borneo and two northeastern coastal islands. Arboreal; diurnal; quadrupedal with leaping. Reported to dive from trees into rivers, where they swim. Highly sexually dimorphic in body size, males weighing about 20 kg, females around 10 kg; males have large pendulous nose, females with smaller upturned nose. Dental formula: 2.1.2.3; folivorous. Live in mixed-sex bands of about 20 individuals; known to form associations with macaques and leaf monkeys.

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