Final answer:
Anaptomorphines were a group of extinct primates that lived during the Eocene epoch, a time of significant evolutionary development for primates, characterized by features like enclosed postorbital bars and a toothcomb.
Step-by-step explanation:
The term anaptomorphines refers to a group of now-extinct primates that lived during the Eocene epoch, a period of significant primatological evolution. The Eocene, spanning from about 54 MYA to 34 MYA, saw primates develop features more comparable to today's species, such as enclosed postorbital bars and anatomical details like the toothcomb, exclusive to strepsirrhine primates.
This epoch marked the retreat of the genus Purgatorius and the emergence of new primate forms with enlarged brains and eyes but smaller muzzles, trends that persisted as primate evolution continued. The Eocene was a time of extensive diversification within the primate lineage, with a surge in the number of strepsirrhine species, suggesting an adaptive radiation in response to the ecological conditions at the time.