Major Questions in the Study of Primate Origins

Adapiformes is reviewed among early euprimate hypotheses using dental, cranial and postcranial evidence, but its relationship to living strepsirrhines and anthropoids varies among analyses; it is not presented as one direct ancestor lineage.

The primate-origins synthesis treats Plesiadapiformes as a diverse Paleogene assemblage whose relationship to crown Primates remains central and contested; the atlas label is not a claim that all included families form one crown-primate ancestor group.

plesiadapiformes is displayed at 66–34 Ma only as the review's heterogeneous sampled assemblage, not a monophyletic crown-primate range. The interval is a source-bounded sample window, not a global FAD, LAD, divergence date, continuous occupancy claim or direct-ancestor assertion.

adapiformes is displayed at 56–34 Ma only as the review's sampled Eocene record, not an ancestor chain or exact global endpoints. The interval is a source-bounded sample window, not a global FAD, LAD, divergence date, continuous occupancy claim or direct-ancestor assertion.