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Shetwemys fajumensis
Discussion
Andrews (1903) figured, by a schematic drawing (see Fig. 3d, as well as fig. 2C in plate 8 of Andrews, 1903), the anterior lobe of an individual that he identified as the type specimen. It is currently lost. Therefore, a neotype is designated here, also corresponding to an anterior plastral lobe: AMNH 5086 (Fig. 1a–b; see also fig. 86B in Gaffney et al., 2011, corresponding to a partial drawing of its ventral view).
Taxonomy
Podocnemis fajumensis was named by Andrews (1903). Its type specimen is CGM 10202, a set of postcrania (anterior plastron), and it is a 3D body fossil. Its type locality is NNW of Birket Qarun, which is in a Rupelian fluvial horizon in the Jebel Qatrani Formation of Egypt.
It was recombined as Neochelys fajumensis by Gaffney et al. (2011); it was recombined as Shetwemys fajumensis by Perez-Garcia (2021).
It was recombined as Neochelys fajumensis by Gaffney et al. (2011); it was recombined as Shetwemys fajumensis by Perez-Garcia (2021).
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1903 | Podocnemis fajumensis Andrews p. 121 figs. Plate VIII, Fig. 2c |
| 1903 | Podocnemis blanckenhorni von Reinach |
| 1906 | Podocnemis fajumensis Andrews p. 291 |
| 2011 | Neochelys fajumensis Gaffney et al. |
| 2021 | Shetwemys fajumensis Perez-Garcia |
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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.
†Shetwemys fajumensis Andrews 1903
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Invalid names: Podocnemis blanckenhorni von Reinach 1903 [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. Perez-Garcia 2021 | It is defined by the following characters recognized as exclusive within this clade: thickening in the visceral plastral area, close to the hypo-xiphiplastral sutures; broad dorsal expansion of the plastral scutes; anteriorly directed and well-developed medial protrusion in the prefrontals–frontals suture. It shows the following unique combination of characters: absence of carapacial medial keel; six neurals; medial contact of the sixth to eighth pairs of costals; heptagonal first vertebral, with short latero-anterior margins, and wider than the nuchal; sub-equal width of the second and third vertebrals, with sub-straight lateral margins, their maximum width being located at the interpleural sulci level; first pair of marginals overlapping on half of the nuchal lateral margins; anal length along the lateral xiphiplastral margin less than 2 times that of the femorals; absence of premaxillary beak; snout length greater than half the orbit length; interorbital width less than the orbital length; suborbital height less than that of the orbit; high cheek emargination, exceeding the ventral orbital margin; convex interparietal anterior margin, located on the frontals. |
Measurements
No measurements are available
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| Source: f = family, c = class, subp = subphylum | |||||
| References: Carroll 1988, Hendy et al. 2009, Uetz 2005 | |||||