<div class="tree_txt_unlinked"><p>Catarrhini
is comprised of Old World monkeys (Cercopithecoidea) and apes
(Hominoidea). Catarrhines first appear in the late Eocene and early
Oligocene in Africa, with Cercopithecoids and "apes" distinguished by
the Miocene when apes radiated into Eurasia. Catarrhines are
distinguished from platyrrhines by several specializations, including
narrower nostrils, contact between the frontal and sphenoid bones, and
an extended bony ear tube. Catarrhines have a 2.1.2.3. dental formula.
All Old World monkeys, gibbons, and some chimpanzees have ischial
tuberosities and sitting pads. Catarrhines lack an entepicondylar
foramen on the humerus.</p>
<p><strong>Citations</strong>: Fleagle 1999</p>
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