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Psephoderma

Reptilia - Sauropterygia

Taxonomy
Psephoderma was named by von Meyer (1858) [Sepkoski's age data: Tr Nori Tr Rhae Sepkoski's reference number: 2,940]. It is not extant. Its type is Psephoderma alpinum.

It was assigned to Cyamodontidae by Carroll (1988) and Pinna and Nosotti (1989); to Cyamodontoidea by Rieppel and Hagdorn (1999); to Placochelyidae by Rieppel (2000); to Placochelyida by Rieppel (2001); and to Placodontia by Sepkoski (2002).

Synonyms
Synonymy list
YearName and author
1858Psephoderma von Meyer
1976Placochelyanus Pinna pp. 10, 13
1988Psephoderma Carroll
1989Psephoderma Pinna and Nosotti
1999Psephoderma Rieppel and Hagdorn p. 381
2000Psephoderma Rieppel
2001Psephoderma Rieppel pp. 63-68, 85-86
2002Placochelyanus Sepkoski, Jr.
2002Psephoderma 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
genusPsephodermavon Meyer 1858

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 2001Squamosal projecting far posteriorly; upper temporal fossa relatively narrow; posterior (nasal) process of premaxilla enlarged and extending backward to reach the frontal, thereby separating the nasals from one another (convergent in Macroplacus); frontal narrowly entering the anterior margin of the pineal foramen; pineal foramen located in front of a distinct step in the skull roof; postfrontal small; the posterior palatine tooth plates elongate in adult (convergent in Macroplacus, and, to a lesser degree, in Cyamodus hildegardis).