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Psephoderma

Reptilia - Placodontia

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. It is the type genus of Psephodermatidae.

It was assigned to Psephodermatidae by Kuhn (1971); 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
1971Psephoderma Kuhn p. 21
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
2002Psephoderma Sepkoski

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Life
Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
subclassSarcopterygii()
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda
Reptiliomorpha
RankNameAuthor
Anthracosauria
subclassAmphibiosauriaKuhn 1967
Cotylosauria()
Amniota
Sauropsida
classReptilia
subclassEureptilia()
Romeriida
Diapsida()
suborderSauropterygia
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.

G. †Psephoderma von Meyer 1858
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Psephoderma alpinum Meyer 1858
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Invalid names: Placochelys malanchinii Boni 1948 [synonym], Placochelys stoppanii Pinna 1980 [synonym], Placodus zitteli Amman 1878 [synonym]
Psephoderma anglicum Meyer 1864
Psephoderma sculptata Rieppel 2002
Invalid names: Placochelyanus Pinna 1976 [synonym]
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).