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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]
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.
Ahaetulla, commonly referred to as Asian vine snakes or Asian whip snakes, is a genus of colubrid snakes distributed throughout tropical Asia.They are considered by some scientists to be mildly venomous and are what is commonly termed as 'rear-fanged' or more appropriately, opisthoglyphous, meaning their enlarged teeth or fangs, intended to aid in venom delivery, are located in the back of the ...
Asian arowanas bear teeth on many bones of the mouth, including the jaws, vomer, palatines, pterygoids, parasphenoid, and tongue. [8] [14] Asian arowana scales are large, cycloid, and, in some varieties, metallic-coloured, with a distinctive mosaic pattern of raised ribs.
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 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 ...
The animal is found solitary, in pairs, or in small family groups [1] in open grassland and forests at an elevation of about 1,000 metres (3,300 ft), [19] and uses caves to rest in. [25] It prefers temperate deciduous forest, but also lives in broad-leaved or subalpine coniferous forest [1] made up of Japanese beech, Japanese oak, [32] alpine ...