''Penegephyrosaurus'' is an

extinct Extinction is the termination of a kind of organism or of a group of kinds (taxon), usually a species. The moment of extinction is generally considered to be the death of the last individual of the species, although the capacity to breed and ...

genus of early

rhynchocephalian Rhynchocephalia (; ) is an order of lizard-like reptiles that includes only one living species, the tuatara (''Sphenodon punctatus'') of New Zealand. Despite its current lack of diversity, during the Mesozoic rhynchocephalians were a diverse gro ...

from the Late Triassic of the United Kingdom. It contains a single species, ''Penegephyrosaurus curtiscoppi''.

References

Sphenodontia Prehistoric reptile genera {{paleo-reptile-stub