Boyer and Gingerich 2019
bring us an excellent and comprehensive review of Plesiadapis (Figs. 1-3), a rodent relative (clade: Glires, Figs. 4, 5) traditionally and wrongly considered a basal primate with rodent-like teeth.
nests with another primate mimic, Daubentonia (Fig. 3), the extant aye-aye, a taxon barely mentioned and not analyzed by Boyer and Gingerich.
From the abstract
“Plesiadapis cookei is a large-bodied plesiadapiform euarchontan (and potential stem primate) known from many localities of middle Clarkforkian North American Land Mammal age, late Paleocene epoch, in the Clarks Fork Basin of northwestern Wyoming.”
From the abstract
“On a broader scale, cladistic analysis of higher-level taxa… indicates that plesiadapids and carpolestids exhibit a greater number of identical character states than previously thought … Even so, analysis of combined data from dentition, cranium, and postcrania still robustly support a link between plesiadapids, saxonellids, and carpolestids (Plesiadapoidea) and does not contradict previous hypotheses suggesting a special relationship of plesiadapoids to euprimates (Euprimateformes).”
Too few taxa,
alas is the one obvious issue with Boyer and Gingerich 2019 (Fig. 4).
Not much else to say.
The large reptile tree (LRT, 1583+ taxa; subset Fig. 5) is an online resource that can and should be employed. Current traditions and textbooks are out of date on this subject. At least consider the taxon list in your more focused studies so you don’t overlook any obvious taxa. Test them yourselves. Don’t make the same mistake.
Boyer DM and Gingerich PD 2019. Skeleton of Late Paleocene Plesiadapis cookei (Mammal, Euarchonta): life history, locomotion, and phylogenetic relationships. University of Michigan Papers on Paleontology 38:269pp.