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Hutchemys walkerorum • A Softshell Turtle (Testudines: Trionychidae: Plastomeninae) from the uppermost Cretaceous (Maastrichtian) Hell Creek Formation, North Dakota, USA, with Implications for the Evolutionary Relationships of Plastomenines and Other Trionychids

Plastomeninae, a clade of fossil turtles that has recently undergone significant revision, are currently known from the Late Cretaceous to the Eocene, with some genera known to survive the end-Cretaceous mass extinction (e.g., Hutchemys). Only one taxon survives past the Paleocene into the Eocene (Plastomenus thomasii). Leer más.

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