Evidence of dietary differentiation among late paleocene-early eocene plesiadapids (mammalia, primates)

Plesiadapis cookei is an extinct relative of extant euarchontans (primates, dermopterans; scandentians), which lived in North America during the late Paleocene. R cookei body mass has been estimated to be similar to 2.2 kg, making it large compared with other species of its genus from North America, but similar to some from Europe. In particular, size as well as dental form similarities to R russelli have been noted.