Sclerosaurus
In Depth As a genus Sclerosaurus is considered to be a close relative of the pareiasaurs. Further Reading - Anatomy and phylogenetic relationships of Sclerosaurus armatus (Amniota: Parareptilia) from the Buntsandstein (Triassic) of Europe. - Journal of Vertebrate Paleontology vol28, issue 4 - Hans-Dieter Sues & Robert R. Reisz - 2008.