Clevosaurus

Clevosaurus (meaning "Gloucester lizard") is an extinct genus of rhynchocephalian reptile from the Late Triassic and the Early Jurassic periods. Species of "Clevosaurus" were widespread across Pangaea, and have been found on all continents except Australia and Antarctica. 5 species of "Clevosaurus" have been found in ancient fissure fill deposits in south-west England and Wales, alongside other sphenodontians, early mammals and dinosaurs. In regards to its Pangaean distribution, "C. hadroprodon" is the oldest record of a sphenodontian from Gondwana.
History of discovery.
The first species of "Clevosaurus" to be described was "C. hudsoni", which was described by William Elgin Swinton in 1939 from a fissure fill deposit in Cromhall Quarry in the county of Gloucestershire, England, with the name of the county lending its name to the genus.
Description.
The teeth of "Clevosaurus" species are elongated and occlude precisely with the opposite pair of teeth, leaving conspicuous wear facets and acting as a self-sharpening cutting surface.
Paleobiology.
Species of "Clevosaurus" were likely insectivorous. Biomechanical modelling suggests that they had high enough tooth pressures and strong enough bite force to crush chitin, indicating that they had the ability to feed on thick shelled beetles as well as possibly small vertebrates.
List of species.
The three species known from the Sinemurian aged Lufeng Formation of China ("C. mcgilli, C.wangi" and "C. petilus") are now considered indeterminate within the genus. Indeterminate remains are also known from the Stormberg Group (either Elliot or Clarens Formation) of South Africa, dating to the Hettangian.
Species.
Below is a cladogram of the relationships within Clevosauridae based on the phylogenetic analysis of Hsiou et al. (2015):
""Clevosaurus" latidens" was recovered outside of Clevosauridae, as the sister taxon of Opisthodontia. It was subsequently assigned to a new genus, "Fraserosphenodon", in 2018.