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Tusks are generally curved and have a smooth, continuous surface. The male narwhal's straight single helical tusk, which usually grows out from the left of the mouth, is an exception to the typical features of tusks described above. Continuous growth of tusks is enabled by formative tissues in the apical openings of the roots of the teeth. [2] [3]
The number of teeth and their function can vary widely between species, with some dolphins having over a hundred teeth in their jaws, while the narwhal has two functional teeth in its upper jaw which grow into long tusks in males. The tusk is used in feeding, navigation and mating and contains millions of sensory pathways, making it the most ...
Horns are projections from the top of the head. True horns are found mainly among: Ruminant artiodactyls. Antilocapridae (); Bovidae (cattle, goats, antelopes etc.).; Giraffidae: Giraffids have a pair of skin covered bony bumps on their heads, called ossicones.
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The molar teeth of Palaeoloxodon species typically show a "dot-dash-dot" wear pattern, [16] with the enamel folds concentrated into a major central structure at the midline of the tooth, which are flanked by smaller folds on either side, and the crowns of the tooth are generally proportionally narrow. [17]
The toothcomb of most lemuriforms includes six finely spaced teeth, four incisors and two canine teeth that are procumbent (tilt forward) in the front of the mouth. [4] [15] The procumbent lower canine teeth are the same shape as the incisors located between them, [15] but they are more robust and curve upward and inward, more so than the incisors. [13]
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Here too Megapiranha provides a unique combination of features amongst its family, with serrasalmids that share the straight axis of the premaxilla typically having a straight dorsal margin and two different planes on which the teeth are placed, while those with a single horizontal plane and concave dorsal surface lack a straight axis. The ...