The most likely contender for the common ancestor of all later catarrhines is:

Name: The most likely contender for the common ancestor of all later catarrhines is:
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Aegyptopithecus is the most likely contender for the common ancestor of all later catarrhines because it is the oldest known catarrhine and exhibits several characteristics that are shared by all later catarrhines, such as a downward-facing nostril and a dental formula of 2.1.2.3.

The Most Likely Contender for the Common Ancestor of All