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Plesiochelys enters the LRT basal to giant island turtles

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Here a DGS tracing
of a turtle skull photo printed in Gaffney 1975 of Late Jurassic turtle, Plesiochelys, can be compared to an apparently precise tracing also produced by Gaffney 1975.

According to Wikipedia,
Eugene S. Gaffney is an American paleontologist and leading authority on the morphology and evolutionary history of turtles.” Today Gaffney remains Curator Emeritus at the American Museum of Natural History in New York City.

Plesiochelys etalloni (Rütimeyer 1873; Gaffney 1975; Late Jurassic) nests at the base of the giant terrestrial turtles in the LRT. This was one of the first turtles to attempt to hide the skull beneath the shell. Plesiochelys was derived from an ancient sister to the snapping turtle, Macrochelys.

References
Gaffney ES 1975. A taxonomic revision of the Jurassic turtles Portlandemys and Plesiochelys. American Museum Novitates 2574.
Peters D unpublished. The dual origin of turtles. ResearchGate.org PDF
Rütimeyer L 1873. Die fossilen Schildkröten von Solothurn und der übrigen Jura-formation.
Denkschr. Schweizer. Naturf. Gessell., band 25:1-185.

wiki/Eugene_S._Gaffney
wiki/Plesiochelys
wiki/Aldabra_giant_tortoise
wiki/Chelonoidis_niger
wiki/Cryptodira
wiki/Pleurodira


Source: https://pterosaurheresies.wordpress.com/2021/12/03/plesiochelys-enters-the-lrt-basal-to-giant-island-turtles/


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