Revised again July 13, 2014 by deleting references to Sclerosaurus and adding references to Emeroleter and Romeriscus.
Not Much Past the Skull is Known
We just looked at the weird flat-skullled, Permian taxon, Lanthanosuchus and learned that it was a key taxon linking the big Permian diadectomorphs to the small lizardy lepidosauriforms. Unfortunately very little is known of the post-crania of Lanthanosuchus. In such cases, we look to predecessor and successor sister taxa in order to make a best guess as to what the missing parts might look like.
We Learn About the Unknown from the Known
As weird as Lanthanosuchus was, currently there are no closer sister taxa than Romeriscus, Emeroleter and Macroleter. So they are our best guess/model to illustrate the unknown post-crania of Lanthanosuchus. The body was likely wide and flat, like the skull. The hands and feet would have been nearly the same size as each other, with relatively short toes, but retaining the primitive phalangeal formula of 23454.
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.
Sues H-D and Reisz RR 2008. Anatomy and Phylogenetic Relationships of Sclerosaurus armatus (Amniota: Parareptilia) from the Buntsandstein (Triassic) of Europe. Journal of Vertebrate Paleontology 28(4):1031-1042. doi: 10.1671/0272-4634-28.4.1031 online