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Placochelys
Taxonomy
Placochelys was named by Jaekel (1902) [Sepkoski's age data: Tr Carn-l Sepkoski's reference number: 940]. It is the type genus of Placochelydae.
It was synonymized subjectively with Psephoderma by Pinna and Nosotti (1989).
It was assigned to Cyamodontidae by Carroll (1988); to Placochelyidae by Kuhn (1971), Rieppel (2000); to Placochelyida by Rieppel (2001); and to Placodontia by Sepkoski (2002).
It was synonymized subjectively with Psephoderma by Pinna and Nosotti (1989).
It was assigned to Cyamodontidae by Carroll (1988); to Placochelyidae by Kuhn (1971), Rieppel (2000); to Placochelyida by Rieppel (2001); and to Placodontia by Sepkoski (2002).
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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.
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| O. Rieppel 2001 | Three 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). |