'The North American PETM fossil record includes a single omomyiform genus Teilhardina (Gingerich, 1993; Rose et al., 2011) as well as a single adapiform genus Cantius (Gingerich, 1986, 1989; Rose et al., 2012). Both genera can be found in earliest Eocene strata in the Bighorn Basin, Wyoming, where Teilhardina appears lower in stratigraphic section, closer to the beginning of the PETM (Rose et al., 2012).' Morse et al. 2019

There's a nice review of early primates here: https://www.athenapub.com/aria1/PAL/17Records-34.html

This represents Rendezvous 8, strepsirrhines, lemurs.

"The Early Eocene notharctid Cantius is one of the oldest and most primitive known euprimates, lying near the base of the adapiform primate radiation." https://www.researchgate.net/publication/12876854_Skull_of_Early_Eocene_Cantius_abditus_Primates_Adapiformes_and_its_Phylogenetic_Implications_with_a_Reevaluation_of_Hesperolemur_actius

"The dental morphology of Cantius suggests this genus is ancestral to modern-day Malagasy lemurs. The primary evidence for this is based on the distinct morphology of the incisors and molars of these primates." https://rede.ecu.edu/wp-content/pv-uploads/sites/383/2018/04/PavellDakota_Graduate.pdf