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de la Fuente et al. 2022 Gestemys powelli Project ID: 000436332 Public
20 Media · 1 Specimen · Managed by: Pablo González Ruiz

We report a new small podocnemidid, Gestemys powelli gen. et sp. nov., based on one nearly complete skull, lower jaw, two shells, and remains of the appendicular skeleton belonging to two specimens from the Eocene Geste Formation of the San Antonio de la Cobres Basin, Salta Province, northwestern Argentina. As in other podocnemidid genera, Gestemys exhibits a fully developed and medially extensive cavum pterygoidei, incisura columellae auris enclosing stapes and eustachian tube, and lacks an exoccipital quadrate contact. Gestemys powelli bears a huge foramen palatinum posterius and a short pterygoid flange that does not reach the basisphenoid suture, exposing the cavum pterygoid. Phylogenetic analyses place Gestemys powelli as a member of the Podocnemididae more closely related to Peltocephalinae and Erymnochelyinae than Podocnemidinae . In regards to paleoenvironmental settings from the Paleogene formations (Maíz Gordo and Geste) of northwestern Argentina (NOA), at least two features differentiate the paleoenvironment where G. powelli was recovered, and that of other podocnemidid turtles of the Maíz Gordo Fm.: i) G. powelli was found in-situ with very little re-working; and ii) in contrast to the muddy rocks of marginal lacustrine setting and humid climate of the Maíz Gordo Fm., G. powelli is associated with a coarse-grained floodplain setting and dry, temperate climate. Such differences highlight the contrasting environmental dynamics in which podocnemidid turtles lived in the Paleogene.

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  ID Part Object Taxonomy Type Date Added Publication Status  
000436676 IBIGEO:P:107 Gestemys powelli Volumetric Image Series 2022-04-28 Restricted Download  
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