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Portlandemys mcdowelli
Taxonomy
Portlandemys mcdowelli was named by Gaffney (1975). Its type specimen is BMNH R2914, a skull (nearly complete skull lacking both lateral temporal regions and left cheek. Mandible lacking posterior portions), and it is a 3D body fossil. Its type locality is Isle of Portland (Portlandemys type locality), which is in a Tithonian marine limestone in the United Kingdom.
Synonymy list
| Year | Name and author |
|---|---|
| 1975 | Portlandemys mcdowelli Gaffney pp. 15-16 fig. 13 |
| 2013 | Portlandemys mcdowelli Pérez-García and Murelaga |
| 2014 | Portlandemys mcdowelli Perea et al. |
| 2017 | Portlandemys mcdowelli 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.
†Portlandemys mcdowelli Gaffney 1975
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| 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. |
Measurements
No measurements are available
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| Source: c = class, subp = subphylum, uc = unranked clade | |||||
| References: Hendy et al. 2009, Carroll 1988 | |||||