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Portlandemys
Discussion
This taxon name was registered on 28 April 2015 in the ZooBank in the LSID: urn:lsid:zoobank.org:act:CC1C205A-8BAD-4541-9A93-AFEC87084DDB
Taxonomy
Portlandemys was named by Gaffney (1975) [Sepkoski's age data: J Tith-u Sepkoski's reference number: 1066].
It was assigned to Eurysternidae by Lapparent de Broin et al. (1996); to Chelonia by Sepkoski (2002); to Plesiochelydiae by Milner (2004); to Eucryptodira by Joyce (2007) and Mateus et al. (2009); to Testudines by Pérez-García and Murelaga (2013); to Testudinata by Perea et al. (2014); and to Plesiochelyidae by Gaffney (1975), Weems (1988), Carroll (1988), Anquetin (2012) and Anquetin et al. (2017).
It was assigned to Eurysternidae by Lapparent de Broin et al. (1996); to Chelonia by Sepkoski (2002); to Plesiochelydiae by Milner (2004); to Eucryptodira by Joyce (2007) and Mateus et al. (2009); to Testudines by Pérez-García and Murelaga (2013); to Testudinata by Perea et al. (2014); and to Plesiochelyidae by Gaffney (1975), Weems (1988), Carroll (1988), Anquetin (2012) and Anquetin et al. (2017).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 1975 | Portlandemys Gaffney pp. 6-7 fig. 13 |
| 1988 | Portlandemys Carroll |
| 1988 | Portlandemys Weems p. 141 figs. Table 2 |
| 1996 | Portlandemys Lapparent de Broin et al. pp. 554-555 |
| 2002 | Portlandemys Sepkoski |
| 2004 | Portlandemys Milner p. 1460 |
| 2007 | Portlandemys Joyce |
| 2009 | Portlandemys Mateus et al. |
| 2012 | Portlandemys Anquetin p. 28 fig. 10 |
| 2013 | Portlandemys Pérez-García and Murelaga |
| 2014 | Portlandemys Perea et al. |
| 2017 | Portlandemys 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.
G. †Portlandemys Gaffney 1975
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†Portlandemys gracilis Anquetin et al. 2015
†Portlandemys mcdowelli Gaffney 1975
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| E. S. Gaffney 1975 | Member of the Plesiochelyidae (sensu Gaffney, present paper) known only from skull; foramen palatinum posterius enclosed by bone as in most other turtles, anteroposterior length of premaxillae longer than in Plesiochelys, angle between labial ridges (of maxillae and lower jaws) more acute than in Plesiochelys, median channel between lingual ridges of palate narrower in comparison with Plesiochelys; length of lower jaw symphysis longer than in Plesiochelys, symphyseal hook developed to the extent seen in Chelydra; prootic process seen in Plesiochelys absent, not contacting processus clinoideus. | |
| J. Anquetin et al. 2017 | Portlandemys can be diagnosed as a “plesiochelyid” by the full list of cranial characters provided above for that taxon. Portlandemys is currently differentiated from Plesiochelys by a proportionally narrower skull, a more acute angle between the labial ridges of maxilla and dentary, the foramina anterius canalis carotici cerebralis located more anteriorly, and a longer mandibular symphysis. |
Measurements
No measurements are available
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| Source: c = class, subp = subphylum, uc = unranked clade | |||||
| References: Carroll 1988, Hendy et al. 2009 | |||||
Age range: base of the Tithonian to the top of the Late/Upper Tithonian or 152.10000 to 145.00000 Ma
Collections (4 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Kimmeridgian | Switzerland (Jura) | P. gracilis (171092 171093) | |
| Tithonian | United Kingdom (England) | Stegochelys planiceps (137748) | |
| Late/Upper Tithonian | United Kingdom (England) | P. sp. (119505) |