At least 9 species of
Clevosaurus are considered valid: • †
Clevosaurus bairdi Sues et al. 1994
McCoy Brook Formation, Canada, Early Jurassic (
Hettangian) • †
Clevosaurus brasiliensis Bonaparte and Sues 2006
Caturrita Formation, Brazil, Late Triassic (
Norian) • †
Clevosaurus cambrica Keeble et al. 2018 St. Bride's Island fissure fill, Wales, Hettangian • †
Clevosaurus hadroprodon Hsiou et al. 2019
Santa Maria Formation, Brazil, Late Triassic (
Carnian) • †
Clevosaurus hudsoni Swinton 1939
Cromhall Quarry fissure fill, England, Rhaetian • †
Clevosaurus minor Fraser 1988 Cromhall Quarry fissure fill, England, Rhaetian • †
Clevosaurus sectumsemper Klein et al. 2015 Woodleaze Quarry fissure fill, England, Rhaetian • †
Clevosaurus nicholasi Bhat et al. 2023
Tiki Formation, India, late Carnian-middle Norian 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. 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.
Clevosaurus is considered to be a member of the group Eusphenodontia by the groups definition, due to it possessing characters not shared with more primitive sphenodontians. By definition, it is excluded from Neosphenodontia. {{clade| ==References==