|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Reptilia - Sauropterygia
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).
|Year||Name and author|
|1858||Psephoderma von Meyer|
|1976||Placochelyanus Pinna pp. 10, 13|
|1989||Psephoderma Pinna and Nosotti|
|1999||Psephoderma Rieppel and Hagdorn p. 381|
|2001||Psephoderma Rieppel pp. 63-68, 85-86|
|2002||Placochelyanus Sepkoski, Jr.|
|2002||Psephoderma Sepkoski, Jr.|
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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.
|O. Rieppel 2001||Squamosal 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).|