A new testudinoid turtle from the middle to late Eocene of Vietnam

PeerJ
Rafaella C GarbinWalter G Joyce

Abstract

Testudinoidea is a major clade of turtles that has colonized different ecological environments across the globe throughout the Tertiary. Aquatic testudinoids have a particularly rich fossil record in the Tertiary of the northern hemisphere, but little is known about the evolutionary history of the group, as the phylogenetic relationships of most fossils have not been established with confidence, in part due to high levels of homoplasy and polymorphism. We here focus on describing a sample of 30 testudinoid shells, belonging to a single population that was collected from lake sediments from the middle to late Eocene (35-39 Ma) Na Duong Formation in Vietnam. The phylogenetic placement of this new material is investigated by integrating it and 11 other species of putative geoemydids from the Eocene and Oligocene to a recently published matrix of geoemydid turtles, that embraces the use of polymorphic characters, and then running a total-evidence analysis. The new material is highly polymorphic, but can be inferred with confidence to be a new taxon, Banhxeochelys trani gen. et sp. nov. It shares morphological similarities with other southeastern Asian testudinoids, Isometremys lacuna and Guangdongemys pingi, but is placed phylogene...Continue Reading

References

Mar 9, 2004·Proceedings. Biological Sciences·Walter G Joyce, Jacques A Gauthier
Jun 10, 2004·Molecular Phylogenetics and Evolution·Phillip Q SpinksWilliam P McCord
Nov 22, 2011·Molecular Phylogenetics and Evolution·João M LourençoYlenia Chiari
May 16, 2017·Molecular Phylogenetics and Evolution·Anieli G PereiraCarlos G Schrago

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