Respuesta :
The atelids (spider monkeys and their close relatives), have dental formulae of 2-1-3-3 and primitive nasal anatomy similar to non-primate mammals. Correct answer: letter A.
This is due to the evolution of their diet. As their diet changed to include more fruits, their teeth adapted to the new diet, resulting in a decrease in the number of incisors, premolars and molars, which is reflected in the 2-1-3-3 dental formula. The primitive nasal anatomy is also a consequence of the change in diet, as their noses adapted to better process the smells and aromas of the fruits they ate.
Evolution of the atelids (spider monkeys and their close relatives)?
The group is believed to have arisen from a common ancestor in the New World during the middle to late Miocene (about 8-12 million years ago). Since then, the group has diversified and spread throughout Central and South America, giving rise to several species, including:
- Spider monkeys
- Woolly spider monkeys
- White-bellied spider monkeys
- Black-headed spider monkeys
The group has also developed a variety of social, dietary and locomotor behaviors, as well as physical characteristics, to adapt to the different environments they inhabit.
Learn more about evolution of monkeys:
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