Answer:
Mistery fossil genus A belongs to the monkeys of the old world.
Explanation:
Old-World Monkeys:
- Most of them are big and robust
- Some of them have hairless bulky structures in the posterior region of their bodies named ischiatic callosities. Their noses are pointing down and their holes are close to each other.
- They have semi-thumb or no thumb at all. They have plane nails.
- They have big brains and skulls.
- They spend most of their time on the ground, resting on rocks or similar places too height. However, they can also be found in trees.
New-World Monkeys:
- They are small-sized animals
- Their brain and skulls are small.
- Their nose holes are separated from each other and pointing at each side.
-
Their thumb is developed because they have arboreal habits, so they need the thumbs to hold to the branches and move.
- They spend most of their time on trees. They hardly move on the floor.
- They also have sharp nails.
- They have long tails and no ischiatic callosities
Mystery fossil genus A
has been dated to the late Pliocene and early Pleistocene.
Its canines were sexually dimorphic, and it had bilophodont molars.
Its postcranial traits indicate that it was a terrestrial quadruped,
and its overall body size was over 55 lb (25 kg).
Mystery fossil genus B
has been dated to the early Miocene.
It is estimated that adults weighed around 2 lb (1 kg),
with some sexual dimorphism possible in body weight and canine size.
Mistery fossil genus A belongs to the monkeys of the old world.
