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Clevosaurus brasiliensis

Reptilia - Clevosauridae

Taxonomy
Clevosaurus brasiliensis was named by Bonaparte and Sues (2006). Its type specimen is PV0748T, a skull (Complete skull), and it is a 3D body fossil. Its type locality is Faxinal do Soturno, Linha São Luiz, which is in a Norian fluvial siltstone/sandstone in the Caturrita Formation of Brazil.

Synonymy list
YearName and author
2006Clevosaurus brasiliensis Bonaparte and Sues p. 918 figs. 1-4
2015Clevosaurus brasiliensis Hsiou et al.
2021Clevosaurus brasiliensis Chambi-Trowell et al. p. 3–4

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
—Osteichthyes()
subclassSarcopterygii()
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
—Tetrapoda
—Reptiliomorpha
—Anthracosauria
subclassAmphibiosauriaKuhn 1967
—Cotylosauria()
RankNameAuthor
—Amniota
—Sauropsida
classReptilia
subclassEureptilia()
—Romeriida
—Diapsida()
—Eosuchia()
—Neodiapsida
—SauriaGauthier 1984
—Lepidosauromorpha(Benton 1983)
superorderLepidosauria()
—Sphenodontia()
infraorderEusphenodontia
familyClevosauridae
genusClevosaurus
speciesbrasiliensis

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

†Clevosaurus brasiliensis Bonaparte and Sues 2006
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Diagnosis
ReferenceDiagnosis
S. A. V. Chambi-Trowell et al. 2021A moderately sized rhynchocephalian with a skull 21–31 mm long, markedly short robust snout and broad skull, and with the following unique combination of features:
1. Acrodont teeth that extend deeply within the premaxillae, maxillae and dentaries, and thereby remain visible along the entire length of the tooth-bearing portions of the jaws even when worn flat.
2. Adult maxilla with two posteriorly positioned flanged teeth, followed distally by one or two smaller, sub-conical teeth.
3. Narrow and elongate palatine, bearing anteriorly a medially positioned cluster of small teeth, in addition to a single small tooth that is laterally displaced from the main palatine tooth row.
4. Interdigitation between the edges of the jugal and postorbital bones, the prefrontal and maxilla, and the pterygoid and palatines, rather than simple overlapping facets (Supplemental Fig. 4A–D).
5. Three longitudinal rows of teeth on the pterygoid, the lateral-most row consisting of just three to four teeth.
6. A near vertical symphysis (less than 120° in lateral view between the direction of the symphysis and the longitudinal axis of the mandible).
7. A pronounced edentulous region between the posterior-most dentary tooth (ultimate additional tooth) and the coronoid process.
8. The ultimate additional tooth on the dentary is significantly larger than all other dentary teeth and is mesiodistally elongated, with an anteriorly placed cusp when unworn.