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Rionegrochelys caldieroi

Reptilia - Testudines

Taxonomy
Rionegrochelys caldieroi was named by De la Fuente et al. (2017). Its type specimen is MPCA-AT 258, a shell (carapace and plastron), and it is a 3D body fossil. Its type locality is El Anfiteatro, Parrita site, which is in a Coniacian/Santonian crevasse splay mudstone in the Plottier Formation of Argentina. It is the type species of Rionegrochelys.

Synonymy list
YearName and author
2017Rionegrochelys caldieroi De la Fuente et al.

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
Sarcopterygii
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda()
Reptiliomorpha
RankNameAuthor
Anthracosauria
Batrachosauria()
Cotylosauria()
Amniota
Sauropsida
classReptilia
Testudinata(Oppel 1811)
orderTestudinesBatsch 1788
suborderPleurodira
Panchelidae
Chelidae(Gray 1825)
genusRionegrochelys
speciescaldieroi

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
M. S. De la Fuente et al. 2017It differs from other panchelids by the following unique combination of characters: the first vertebral scute is twice as wide as long and subrectangular in shape, a prominent and discontinuous mid-carapace crest, a strong nuchal notch, peripheral bones 2–11 with strongly gutter ends, posterior margin of the vertebral 5 in the carapace is three lobe shaped, the plastron longer than the carapace, an anteriorly wide thoracic vertebra 1 that is tapered posteriorly in ventral view, in its heart-shaped carapace, and in its wide and short cuneiform mesoplastra crossed by a humeropectoral sulcus.