Sapheosaurus thiollierei (Meyer 1850, Kimmeridgian Late Jurassic, France) has been known and largely ignored for a long time. Two species of this large sphenodontian are identified, S. laticeps with 22 presacrals and S. thiollierei with 26. Both are larger than more primitive forms like Leptosaurus.

Leptosaurus pulchellus (Fitzinger 1837, Renesto and Viohl 1997, Kallimodon, SCHA 40, Jura Museum, Kimmeridgian Late Jurassic, France) is basal to Sapheosaurus and Noteosuchus on one branch, Trilophosaurus and rhynchosaurs on the other branch.

Vadasaurus herzogi (Bever and Norell 2017, Late Jurassic) AMNH FARB 32768, was originally nested between Sapheosaurus + Kallimodon and the aquatic pleurosaurs, Pleurosaursus and Palaeopleurosaurus. Here Vadasaurus nests very closely with Leptosaurus (above), a taxon omitted originally. Close examination of the literature shows that Bever and Norell overlooked the supratemporal, the jugal's quadratojugal process and added a mandible fenestra that is not present.

Bever GS and Norell MA 2017. A new rhynchocephalian (Reptilia: Lepidosauria) from the Late Jurassic of Solnhofen (Germany) and the origin of the marine Pleurosauridae. Royal Society open scence. 4: 170570. http://dx.doi.org/10.1098/rsos.170570

Fitzinger LJF 1837. Vorläufiger Bericht über eine höchst interessante Entdeckung -Dr. Natterers in Brasil. Oken's Isis.

von Meyer H 1850. Mittheilungen an Professor Bronn gerichtet: Neües Jahrbuch fur Mineralogie, Geologie und Palaontologie, Bd 18, p. 195-204.

Renesto S and Viohl G 1997. A sphenodontid (Reptilia, Diapsida) from the late Kimmeridgian of Schamhaupten (Southern Franconian Alb, Bavaria, Germany). Archaeopteryx 15:27-46

wiki/Sapheosaurus
wiki/Leptosaurus
wiki/Vadasaurus