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An African elephant in Tanzania, with visible tusks. Tusks are elongated, continuously growing front teeth that protrude well beyond the mouth of certain mammal species. They are most commonly canine teeth, as with narwhals, chevrotains, musk deer, water deer, muntjac, pigs, peccaries, hippopotamuses and walruses, or, in the case of elephants, elongated incisors.
It is distinguished from other dicynodonts by the presence of a distinct ridge running along the side of the skull from below the eye socket to the area around the tusks. The skull of Daqingshanodon is less than 10 centimetres (3.9 in) long, yet this specimen is thought to have been an adult on the basis of its well-developed nasal bosses.
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.
Although Java mouse-deer do not possess antlers or horns like regular deer, male Java mouse-deer have elongated, tusk-like upper canines which protrude downward from the upper jaw along the sides of their mouth. Males use these “tusks” to defend themselves and their mates against rivals. [9]
Elephantiformes is a suborder within the order Proboscidea. [1] Members of this group are primitively characterised by the possession of upper tusks, an elongated mandibular symphysis (the frontmost part of the lower jaw) and lower tusks, and the retraction of the facial region of the skull indicative of the development of a trunk. [2]
This is an accepted version of this page This is the latest accepted revision, reviewed on 20 January 2025. Taxonomic group of semi-aquatic mammals Pinnipeds Temporal range: Latest Oligocene – Holocene, 24–0 Ma Pre๊ ๊ O S D C P T J K Pg N Clockwise from top left: Grey seal (Halichoerus grypus), Steller sea lion (Eumetopias jubatus), New Zealand fur seal (Arctocephalus forsteri), walrus ...
Their heads of elongated and downward-sloping. [5]: 181 As with many members of the genus Sus, the pigs' straight lower canines are triangular in cross-section. The canines curve upwards and compromise the male pigs' tusks. In fact, the lower surface of Philippine warty pigs' canines is typically 150% greater in diameter than the posterior surface.
Like Platybelodon, the mandibular symphysis of this species was narrow and elongated, and possessed two flattened tusks. Investigation of the structure of the lower tusks revealed that those of Protanancus were concentric, like those of most proboscideans (including present-day proboscideans), while those of Platybelodon possessed dentinal tubules.