The skull of Tetraceratops insignis (Synapsida, Sphenacodontia)

@inproceedings{Spindler2020TheSO,
  title={The skull of Tetraceratops insignis (Synapsida, Sphenacodontia)},
  author={Frederik Spindler},
  year={2020}
}

Distributions of extinction times from fossil ages and tree topologies: the example of mid-Permian synapsid extinctions

TLDR
The timing of extinctions of these three Permo-Carboniferous synapsid taxa and of their component lineages supports the idea that the biological crisis in the late Kungurian/early Roadian consisted of a progressive decline in biodiversity throughout the Kungurians.

Distributions of extinction times from fossil ages and tree topologies: the example of some mid-Permian synapsid extinctions

Given a phylogenetic tree that includes only extinct, or a mix of extinct and extant taxa, where at least some fossil data are available, we present a method to compute the distribution of the

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

TLDR
CT scanning techniques are used to digitally reconstruct the bones and trigeminal canals of the snout of Raranimus in 3D and confirm that RarAnimus shares a high number of synapomorphies with more derived therapsids and is the only theraapsid known so far to display a "pelycosaur"-like maxillary canal bearing a long caudal alveolar canal that gives off branches at regular intervals.

A faunivorous early sphenacodontian synapsid with a diastema

TLDR
The diagnosis of this new form, Kenomagnathus scottae gen. et sp.