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Placochelys

Reptilia - Sauropterygia

Taxonomy
Placochelys was named by Jaekel (1902) [Sepkoski's age data: Tr Carn-l Sepkoski's reference number: 940].

It was synonymized subjectively with Psephoderma by Pinna and Nosotti (1989).

It was assigned to Cyamodontidae by Carroll (1988); to Placochelyidae by Rieppel (2000); to Placochelyida by Rieppel (2001); and to Placodontia by Sepkoski (2002).

Synonymy list
YearName and author
1902Placochelys Jaekel
1988Placochelys Carroll
2000Placochelys Rieppel
2001Placochelys Rieppel
2002Placochelys Sepkoski, Jr.

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
Sarcopterygii
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda()
Reptiliomorpha
Anthracosauria
RankNameAuthor
Batrachosauria()
Cotylosauria()
Amniota
Sauropsida
classReptilia
subclassEureptilia()
Romeriida
Diapsida()
orderSauropterygia
Placodontiformes
orderPlacodontiaCope 1871
suborderCyamodontoideaNopcsa 1923
PlacochelyidaRomer 1956
genusPlacochelysJaekel 1902

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
O. Rieppel 2001Three maxillary teeth; posterior process of premaxilla extending backward beyond the level of the anterior margin of the orbit; frontal narrowly exposed between the posterior parts of nasals; anterolateral processes of frontal weakly developed; maxilla flooring the external naris (convergent in Cyamodus); squamosal and quadratojugal extending anteriorly within the temporal arch to a level in front of the anterior margin of the upper temporal fossa; foramen piercing the suspensorium between the quadrate, squamosal, and quadratojugal; basioccipital tuber and the ventral flange of the opisthotic meet ventral to the passage of the internal carotid, and meet the posterior margin of the basicranium (convergent in Protenodontosaurus, unknown in Psephoderma).