Sapheosaurus was an extinct genus of Late Jurassic sphenodont. Its skull was longer and narrower than that of Homoeosaurus.[3] It was classified as a genus of sapheosaur by Michael Benton in 1985.[2] It reached a length of 70 cm from snout to tail.[4]Sapheosaurus belongs to the clade Sapheosauridae, that also includes other taxa like Kallimodon. It is believed to be one of two aquatic sphenodont lineages, with Pleurosauridae being the other.[5][6]
^BOULENGER, G. (1919). Sur le genre Sapheosaurus, Rhynchocephalien du Kiméridgien de Cerin. CR Acad. Sci. Paris, 605-607.
^Marc E. H. Jones, Skull shape and feeding strategy in Sphenodon and other Rhynchocephalia (Diapsida: Lepidosauria), Article in Journal of Morphology 269(8):945-66 · August 2008 DOI: 10.1002/jmor.10634 · Source: PubMed