<div class="tree_txt_unlinked"><p>Platyrrhines,
or New World monkeys, are found in South America and date to the late
Oligocene. Current consensus hypothesizes platyrrhines (or their
ancestors) migrated from West Africa to South America by rafting across
the Atlantic. Platyrrhini are distinguished by several characteristics,
including broader nostrils than catarrhines, contact between the
zygomatic and parietal bones, and a fused tympanic ring that does not
extend laterally as a bony tube. They are dentally similar to
catarrhines, but with a dental formula of 2.1.3.3. (or 2.1.3.2. in
Callitrichids), and lack hypoconulids on the first two lower molars. <em>Atelinae</em> and <em>Cebus</em>, have prehensile or semi-prehensile tails, respectively.</p>
<p><strong>Citations</strong>: Dagosto 2002, and Fleagle 1999</p>
</div>