Nosmips aenigmaticus is a rare fossil primate known only from 12 teeth.

Most teeth were found at a site in the Fayum Depression about 40 miles (64 km) outside Cairo, Egypt.

[3] Nosmips aenigmaticus probably lived 37 million years ago in Africa and has not been successfully classified within any group of primates.

[4] In particular, it is distinct from the three main branches of primate found in Africa at the time - anthropoids, adapiforms and lemuriforms.

The name was chosen to honour paleontologist and anagram enthusiast George Gaylord Simpson.