|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Reptilia - Testudines - Plesiochelyidae
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.
|J. Anquetin et al. 2017||Portlandemys mcdowelli can be diagnosed as a “ple- siochelyid” and a representative of Portlandemys by the full list of cranial characters provided for these taxa above. Portlandemys mcdowelli differs from Portlandemys gracilis by having a more robust cranium, a strong processus trochlearis oticum formed equally by the quadrate and prootic, a midline contact of the prefrontals preventing a nasal-frontal contact on the dorsal sur- face of the skull roof, the presence of a ridge closing the ptery- goid fossa posteriorly, foramen posterius canalis carotici interni located close to the basisphenoid-pterygoid suture on the pos- teromedial part of the pterygoid, absence of a raised pedestal on the dorsal surface of the pterygoid contacting the processus interfenestralis of the opisthotic, basisphenoid triangular in out- line in ventral view, a more robust mandible with a high profile in lateral view, strongly developed lingual ridges on the mandible, a symphyseal region more pointed anteriorly as seen in dorsal view, presence of a strong symphyseal hook, and a more trapezoidal splenial.|