Well, I'm looking at a chart in "The Prehistory of the Mind" by Mithen (p
199), that shows Old World Monkeys and Apes both descended from a species
called Aegyptopithecus, from which New World Monkeys are *not* descended.
If this is right, then 'monkey' is either not a monophyletic group, or all
apes are monkeys.
--CarlF