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Sinodonty is a particular pattern of teeth characterized by the following features: The upper first incisors and upper second incisors are shovel-shaped, and they are "not aligned with the other teeth". [11] The upper first premolar has one root, and the lower first molar in Sinodonts has three roots (3RM1). [11] [5]
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 ...
The proboscis of the tapir is a highly flexible organ, able to move in all directions, allowing the animals to grab foliage that would otherwise be out of reach. Tapirs often exhibit the flehmen response , a posture in which they raise their snouts and show their teeth to detect scents.
The common name of the genus comes from the kukri, a distinctively shaped Nepalese knife, which is similar in shape to the broad, flattened, curved hind teeth of Oligodon species. These teeth are specially adapted for their main diet of eggs; the teeth cut open eggs as they are being swallowed by the snake, allowing for easier digestion.
The teeth also are more highly specialized, and show an approach to those of Felidae, although more primitive. The dental formula is 3.1.4.1 3.1.4.2 . The incisors form a transverse, not a curved, line; the first three upper and the four lower pre- molars are compressed and trenchant with a high, sharp, median cusp and small subsidiary cusps in ...
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It was theorized that positive selection for shovel-shaped incisors over the spatulate incisors is more commonly found within cultures that used their teeth as tools due to a greater structural strength in increased shovel-shaped incisors. [2] In some instances, incisors can present a more pronounced version of this called double shovel-shaped.
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