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Further, alopecia is associated with enclosures where animal density is highest as it may cause stress-induced physiological or behavioural changes that can lead to hair loss. [ 17 ] [ 18 ] The type of material used to cover the ground of the enclosure has also mediated alopecia in primates as greater hair loss was associated with gravel ...
Extant primates exhibit a broad range of variation in sexual size dimorphism (SSD), or sexual divergence in body size. [4] It ranges from species such as gibbons and strepsirrhines (including Madagascar's lemurs) in which males and females have almost the same body sizes to species such as chimpanzees and bonobos in which males' body sizes are larger than females' body sizes.
The teeth were originally dated to 10.5–10 million years ago (mya), and the discoverers then concluded that the gorilla–human LCA existed about 12 mya, but they were re-dated to about 8 mya. If Chororapithecus was indeed a stem gorilla, the latter date is more consistent with the timing of 8 mya for the LCA according to molecular data.
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]
Changes to the dental morphology and jaw are major elements of hominid evolution. These changes were driven by the types and processing of food eaten. The evolution of the jaw is thought to have facilitated encephalization, speech, and the formation of the uniquely human chin.
Most of the teeth are larger in males, [25] and the canine teeth reach up to 4.5 cm (1.8 in) and 1 cm (0.39 in) long for males and females respectively. [22] Both sexes have 7–10 cm (2.8–3.9 in) long tails. [24] Male and female mandrills, showing size and color dimorphism
The western gorilla (Gorilla gorilla) is a great ape found in Africa, one of two species of the hominid genus Gorilla. Large and robust with males weighing around 168 kilograms (370 lb), the species is found in a region of midwest Africa, geographically isolated from the eastern gorilla (Gorilla beringei). The hair of the western species is ...
Post canine enlargement has also been significantly positively correlated with basal metabolic rate, independently of body size. [21] Larger primates tend to need larger teeth to process more food to meet the energy requirements of a larger body, [22] but the evolution of postcanine megadontia is more likely due to the quality of the diet. The ...