|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Reptilia - Testudines - Plesiochelyidae
It was recombined as Stegochelys planiceps by Lydekker (1889) and Delair (1958); it was recombined as Plesiochelys planiceps by Gaffney (1975), Pérez-García and Murelaga (2013), Anquetin et al. (2015) and Anquetin et al. (2017).
|Year||Name and author|
|1842||Chelone planiceps Owen pp. 168-169 figs. first plate 8, figs 1-3|
|1889||Stegochelys planiceps Lydekker p. 229|
|1958||Stegochelys planiceps Delair p. 55|
|1975||Plesiochelys planiceps Gaffney pp. 6-7|
|2013||Plesiochelys planiceps Pérez-García and Murelaga|
|2015||Plesiochelys planiceps Anquetin et al.|
|2017||Plesiochelys planiceps Anquetin et al.|
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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.
|E. S. Gaffney 1975||Member of the Plesiochelyidae (sensu Gaffney, present paper) known only from the skull; distinguishable from Plesiochelys etalloni by the following features: lingual ridge of maxilla higher than in P. etalloni, anterior portion of lingual ridge on lower jaw curving medially (as opposed to anteriorly in P. etalloni), at level of vomer-premaxilla suture the distance between lingual ridges of maxillae being wider than in P. etalloni.|
|J. Anquetin et al. 2017||Plesiochelys planiceps can be diagnosed as a “plesiochelyid” and a representative of Plesiochelys by the full list of cranial characters provided for these taxa above. Plesiochelys planiceps differs from other Plesiochelys spp. by its larger size, a higher lingual ridge on the maxilla, the absence of a contact between the parietal and the quadrate posterior to the foramen nervi trigemini, a strongly developed processus trochlearis oticum, a canalis caroticus internus situated deep within bone, a foramen posterius canalis carotici interni opening on the posterior margin of the pterygoid and not visible in ventral view, and each exoccipital forming one-third of the condylus occipi- talis. In addition, Plesiochelys planiceps differs from Plesiochelys etalloni by having a wider distance between the lingual ridges of the maxilla at the level of the pterygoid-vomer suture, an elon- gated foramen palatinum posterius, and the anterior portion of the lingual ridge on the dentary curving medially (as opposed to anteriorly). It differs from Plesiochelys bigleri by having a higher temporal skull roof, a deeper pterygoid fossa, a more developed processus trochlearis oticum, a foramen anterior nervi abducentis located more posteriorly relative to the base of the proces- sus clinoideus, and the foramina anterius canalis carotici cerebralis located almost vertically below the dorsum sellae.|