Pretty darn close it appears.
And these two clades have NEVER been closely associated before. This is the sort of wonderful nesting you get when you just let it happen with a large gamut of reptiles.
Of course this goes against the grain of traditional paleontology that puts caseasaurs like Eothyris, Oedaleops, Casea, Cotylorhynchus and Ennatosaurus improbably and awkwardly alongside synapsids, like Varanodon and Ophiacodon.
Tradition also puts diadectids like Orobates and Diadectes outside the Reptilia alongside other amphibians. The large reptile tree solves all such problems. The two clades, Diadectidae and Caseasauria, are close kin as it turns out. And the skull images bear this out, if you just ignore the lateral temporal fenestra, which is a trait that comes and goes with the Millerettidae, of which the caseasaurs are members.
I hate it when a blind eye is turned to toward such relationships. Tradition trumps testing in most cases. That’s why I’m here… to encourage young free thinkers to test everything in the Reptilia to see if it matches tradition or the large reptile tree.
As always, I encourage readers to see specimens, make observations and come to your own conclusions. Test. Test. And test again.
Evidence and support in the form of nexus, pdf and jpeg files will be sent to all who request additional data.