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Gestemys powelli
Discussion
Derivation of name. The species epithet powelli refers to the palaeontologist Prof. Dr Jaime Powell from the Universidad Nacional de Tucuman, who recently passed away, for his contributions to the knowledge of the fossil vertebrates from north-western Argentina.
Taxonomy
Gestemys powelli was named by de la Fuente et al. (2022). Its type specimen is IBIGEO-P 107, a partial skeleton (A nearly complete skull, lower jaw and a partially preserved carapace and plastron with some appendicular remains inside.), and it is a 3D body fossil. Its type locality is near San Antonio de los Cobres, which is in an Eocene lacustrine - small sandstone in the Geste Formation of Argentina. It is the type species of Gestemys.
Synonymy list
| Year | Name and author |
|---|---|
| 2022 | Gestemys powelli de la Fuente 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.
†Gestemys powelli de la Fuente et al. 2022
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| M. S. de la Fuente et al. 2022 | Gestemys powelli differs from other podocnemidids in: possessing a huge foramen palatinum posterius; its short pterygoid flange does not reach the basisphenoid suture, allowing the cavum pterygoid to be exposed; the triturating surface of the lower jaw is relatively narrow, so that it ends in an extremely tapered symphysis; and the area articularis mandibularis is flat. Another diagnostic feature is the sagittal profile of the carapace, which displays a noticeable outline angle change at the level of the eighth costal and suprapygal bones where the posterior end of the shell descends abruptly. Regarding the plastron, its short and sub quadrangular anterior plastral lobe is twice as wide as it is long, and a punctual contact between the gular scute and humero-pectoral sulcus prevents midline contact of the humeral scutes. |
Measurements
No measurements are available
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| Source: f = family, c = class, subp = subphylum | |||||
| References: Hendy et al. 2009, Carroll 1988, Uetz 2005 | |||||
Age range: Late/Upper Eocene or 37.20000 to 33.90000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Eocene | Argentina (Salta) | Gestemys powelli (type locality: 226782) |