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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 holotype of the younger species O. leptodon was found with both tusks in situ, the right one was needle-like and 1.35 metres (4 ft 5 in) long, 1.07 metres (3 ft 6 in) of which being located outside of the premaxillary process, the left tusk was only 25 cm (9.8 in) long, similar in length to the small tusk of O. perivianus. Despite the small ...
The upper tusks (or upper incisors) of Mammut differ from those of Zygolophodon by the generally larger sizes, tendency to either straighten or curve up, and the typical lack of any enamel band, although M. vexillarius retains a very narrow strip of enamel in the upper tusks. The lower (or mandibular) tusks tend to be reduced in comparison.
The two upper incisors are large and tusk-like, and grow continuously through life, similar to those of rodents. The four lower incisors are deeply grooved "comb teeth". A diastema occurs between the incisors and the cheek teeth. The dental formula for hyraxes is 1.0.4.3 2.0.4.3.
The upper tusks of primitive longirostrine gomphotheres typically gently curve downwards, [3] and generally do not exceed 2 metres (6.6 ft) in length and 35 kilograms (77 lb) in weight, [7] though some later brevirostine gomphotheres developed considerably larger upper tusks.
The tusks are of a quite different shape in each. Barking deer in Jim Corbett National Park , India A captive young Chinese muntjac buck with exposed canine tooth Head of a muntjac buck, showing the slanted, furred pedicles.
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Dicynodontia is an extinct clade of anomodonts, an extinct type of non-mammalian therapsid.Dicynodonts were herbivores that typically bore a pair of tusks, hence their name, which means 'two dog tooth'.