Purgatorius and Plesiadapis are still not primates contra Wilson et al. 2021

Short one today
on Purgatorius (Early Paleocene; Fig. 1), a mandible taxon considered by Wilson et al. 2021 to be a member of the Plesiadapiformes (Fig. x).

Figure 1. Purgatorius compared to other basal and often Paleocene mammals.

Figure 1. Purgatorius compared to other basal and often Paleocene mammals.

Wilson et all 2021 report
“Plesiadapiforms are crucial to understanding the evolutionary and ecological origins of primates and other euarchontans (treeshrews and colugos) as well as the traits that separate those groups from other mammals.”

No they are not.

Adding taxa
shifts plesiadapiformes deep into the clade Glires (Fig. x) where Plesiadapis joins Daubentonia as primate-like rodents close to Carpolestes and Ignacius.

Figure 1. Ignacius and Plesiadapis nest basal to Daubentonia in the LRT.

Figure 2. Ignacius and Plesiadapis nest basal to Daubentonia in the LRT.

Wilson et al. also reported
similarities in Purgatorius to Palaechthon, which nested in 2017 with the demopteran, Cynocelphalus in the large reptile tree (LRT, 1807+ taxa). Wilson et al. considered Palaechthon a member of the Plesiadapiformes.

Figure 1. Subset of the LRT focusing on basal placentals, including multituberculates.

Figure x. Subset of the LRT focusing on basal placentals, including multituberculates.

We looked at Purgatorius earlier
here in 2017.

Colleagues, expand your taxon lists.
If you don’t look in there, you won’t see what’s in there. So look. Add taxa. Sometimes traditions, professors and textbooks are not complete or incorrect. Find out for yourself.


References
Wilson MGP et al. , (9 co-aiuthors) 2021. Earliest Palaeocene purgatoriids and the initial radiation of stem primates Royal Society open science 8210050
http://doi.org/10.1098/rsos.210050

https://pterosaurheresies.wordpress.com/2019/03/07/tweaking-palaechthon-basal-volitantia/

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