Temporal range: Late Triassic - Early Jurassic Carnian–Sinemurian
PreꞒ
Ꞓ
O
S
D
C
P
T
J
K
Pg
N
Skulls of Clevosaurus hudsoni (left) and C. cambrica (right)
Scientific classification
Domain:
Eukaryota
Kingdom:
Animalia
Phylum:
Chordata
Class:
Reptilia
Order:
Rhynchocephalia
Family:
†Clevosauridae
Genus:
†Clevosaurus Swinton, 1939
Species
See text
Synonyms
Dianosaurus Young, 1982
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.[1] Five 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,[2] though its affinity to Clevosaurus has been questioned.[3]
Reconstructions of the skulls of C. hudsoni (A) and C. cambrica (B), reconstructed areas in orange.
^Sues, H. D.; Reisz, R. (1995). "First record of the early mesozoic sphenodontian clevosaurus (lepidosauria: rhynchocephalia) from the southern hemisphere". Journal of Paleontology. 69 (1): 123–126. Bibcode:1995JPal...69..123S. doi:10.1017/s0022336000026974. S2CID 131414921.
^"A new sphenodontian from Brazil is the oldest record of the group in Gondwana". phys.org. Retrieved 2019-08-15.
^Chambi-Trowell, Sofia A. V.; Martinelli, Agustín G.; Whiteside, David I.; Vivar, Paulo R. Romo de; Soares, Marina Bento; Schultz, Cesar L.; Gill, Pamela G.; Benton, Michael J.; Rayfield, Emily J. (2021-06-03). "The diversity of Triassic South American sphenodontians: a new basal form, clevosaurs, and a revision of rhynchocephalian phylogeny". Journal of Systematic Palaeontology. 19 (11): 787–820. Bibcode:2021JSPal..19..787C. doi:10.1080/14772019.2021.1976292. hdl:1983/af14affc-a26e-426b-83ca-e1833e355882. ISSN 1477-2019. S2CID 240487298.
of Clevosaurus were widespread across Pangaea, and have been found on all continents except Australia and Antarctica. Five species of Clevosaurus have...
member of Sphenodontia Reconstruction of the skulls of Clevosaurus hudsoni (A) and Clevosaurus cambrica (B) Skull of the basal eusphenodontian Opisthiamimus...
Victor-Hugo Reynoso established that three particular genera of Sphenodontia (Clevosaurus, Brachyrhinodon, and Polysphenodon) were closely related to each other...
lips are hard and keratinous, forming a solid beak. Clevosaurids like Clevosaurus are notable for the presence of bone "lips"; in these species the tooth-like...
prey. Similarly the "tooth lips" of clevosaurid sphenodontians such as Clevosaurus are described as "carnassial-like". A lineage of pycnodont fish also...
Elsler, Armin; Benton, Michael J. (July 2018). "Taxonomic reassessment of Clevosaurus latidens Fraser, 1993 (Lepidosauria, Rhynchocephalia) and rhynchocephalian...
PMID 37735997. Fraser, N. C. (1988a). The osteology and relationships of Clevosaurus (Reptilia: Sphenodontida). Philosophical Transactions of the Royal Society...
sphenodontian, more derived than Diphydontosaurus but more basal than Clevosaurus. Cladogram after: Planocephalosaurus robinsonae was a small sphenodontian...
in the abdomen, as well as bone from the skull of a small sphenodont, Clevosaurus. This indicates that these dinosaurs were omnivorous, with a diet mainly...
Soturnia caliodon, the lepidosaur Cargninia enigmatica, the sphenodontid Clevosaurus brasiliensis, and some small therapsids coexisting with Faxinalipterus...
have placed Polysphenodon as part of the family Clevosauridae alongside Clevosaurus and Brachyrhinodon, though other studies have recovered Polysphenodon...
Marco Aurélio Gallo De; Ferigolo, Jorge (2015-09-10). "New Data on the Clevosaurus (Sphenodontia: Clevosauridae) from the Upper Triassic of Southern Brazil"...
Gloucestershire preserved alongside the common fossil rhynchocephalian Clevosaurus. The type specimen had been collected in 1953, but was only described...
related to Clevosaurus, placing both genera as part of the family Clevosauridae, with some studies finding B. taylori nested within Clevosaurus. Other studies...
distinctive Late Triassic microvertebrate fissure fauna and a new species of Clevosaurus (Lepidosauria: Rhynchocephalia) from Woodleaze Quarry, Gloucestershire...
Pant-y-ffynnon Quarry fissures, South Wales, UK and a new species of Clevosaurus (Lepidosauria: Rhynchocephalia)" (PDF). Proceedings of the Geologists'...
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