A re-assessment of the oldest therapsid Raranimus confirms its status as a basal member of the clade and fills Olson's gap.

@article{Duhamel2021ARO,
  title={A re-assessment of the oldest therapsid Raranimus confirms its status as a basal member of the clade and fills Olson's gap.},
  author={A Duhamel and Julien Benoit and Bruce S. Rubidge and J. Liu},
  journal={Die Naturwissenschaften},
  year={2021},
  volume={108 4},
  pages={
          26
        }
}
The non-mammalian therapsids comprise a paraphyletic assemblage of Permian-Jurassic synapsids closely related to mammals that includes six major clades of largely unresolved phylogenetic affinity. Understanding the early evolutionary radiation of therapsids is complicated by a gap in the fossil record during the Roadian (middle Permian) known as Olson's gap. Because of its early stratigraphic occurrence and its primitive features, Raranimus dashankouensis, from the Dashankou fauna (Rodian… 
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