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Kaikaifilusaurus calvoi

Reptilia - Rhynchocephalia

Taxonomy
Kaikaifilusaurus calvoi was named by Simon and Kellner (2003). Its type specimen is MPCHv 4, a mandible (left lower jaw, lacking the posterior region), and it is a 3D body fossil. Its type locality is Araceli, on Bustingorry farm, which is in a Cenomanian fluvial sandstone/conglomerate in the Candeleros Formation of Argentina.

It was considered a nomen dubium by Apesteguia and Carballido (2014).

Synonyms
Synonymy list
YearName and author
2003Priosphenodon avelasi Apesteguía and Novas
2003Kaikaifilusaurus calvoi Simon and Kellner p. 1
2019Kaikaifilusaurus calvoi Gentil et al.

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
Sarcopterygii
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda()
Reptiliomorpha
Anthracosauria
Batrachosauria()
Cotylosauria()
Amniota
Sauropsida
RankNameAuthor
classReptilia
subclassEureptilia()
Romeriida
Diapsida()
Eosuchia()
Neodiapsida
SauriaGauthier 1984
Lepidosauromorpha(Benton 1983)
superorderLepidosauria()
orderRhynchocephalia
suborderSphenodontia()
infraorderEusphenodontia
Neosphenodontia
Opisthodontia
subfamilyEilenodontinae
genusKaikaifilusaurus
speciescalvoi

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.

Diagnosis
ReferenceDiagnosis
S. Apesteguía and F. E. Novas 2003 (Priosphenodon avelasi)Priosphenodon differs from other sphenodontians in the following combination of features: robust skeleton with adult up to 1m long; single, sharp, beak-like structure on the rostral end of the skull; bulging nasals; frontals rostrally straight; jugals dorsoventrally deep; suborbital fenestrae closed by transversely oriented ectopterygoids; maxillary and palatine tooth rows elongate, straight and in parallel; palatal roof narrow; teeth closely packed, with imbricate labial and lingual flanges; no caniniform teeth and no dental regionalization; and square, distally expanded unguals.
M. E. Simon and A. W. A. Kellner 2003Eilenodontian sphenodontid with lower jaw showing a marked dorsoventral symphysial expansion on the medial surface; dorsoanteriorly oriented edentulous ridge; short anteroposteriorly oriented symphysial shelf; pronounced gap between the coronoid process and the last tooth; and ventral margin of the dentary close to the symphysis strongly concave