| Duke University
Lemur Center Division of Fossil Primates |
| RW Wilson and FS Szalay, Novitates 2499, 21 July 1972, p. 8. |
| This illustrates what is possibly the oldest skull of an animal related to primates. Palaecthon is another probable microsyopid from the Paleocene of New Mexico. Note the very broad forehead, which prevents the orbits from being directed frontally. Microsyopids differ from plesiadapoids, or true primates, in that they do not seem to have an ossified auditory bulla in the ear region. |