A neglected lineage of North American turtles fills a major gap in the fossil record

@article{Joyce2010ANL,
  title={A neglected lineage of North American turtles fills a major gap in the fossil record},
  author={Walter G. Joyce and Tyler R. Lyson},
  journal={Palaeontology},
  year={2010},
  volume={53}
}
  • W. Joyce, T. Lyson
  • Published 1 March 2010
  • Biology, Environmental Science, Geography
  • Palaeontology
Abstract:  The fossil record of the two primary subclades of softshell turtles (Trionychidae) is exceedingly asymmetric, as a result of a ghost range of total clade Cyclanorbinae that is estimated at 80 Ma. Herein, we present the first phylogenetic analysis of Trionychidae that includes a representative of the poorly studied taxon Plastomenidae, which is known from the Campanian to Eocene of North America. The analysis reveals that plastomenids are stem cyclanorbines, thus significantly… 
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TLDR
Turtles of the clade Pan-Trionychidae have a rich, but fragmentary fossil record in the New World, ranging from the Late Cretaceous to the Holocene, but the placement of most fossil taxa remains poorly resolved relative to these two primary clades.
A Review of the Fossil Record of Old World Turtles of the Clade Pan-Trionychidae
  • G. Georgalis, W. Joyce
  • Geography, Environmental Science
    Bulletin of the Peabody Museum of Natural History
  • 2017
Abstract Turtles of the clade Pan-Trionychidae have a rich fossil record in the Old World, ranging from the Early Cretaceous (Hauterivian) to the Holocene. The clade most probably originated in Asia…
Two New Plastomenine Softshell Turtles from the Paleocene of Montana and Wyoming
TLDR
A phylogenetic analysis places the new species of plastomenine softshell turtles (Trionychidae) that are referred to Hutchemys gen. nov in a clade that is sister to Plastomenus aff.
First record of soft-shelled turtles (Cryptodira, Trionychidae) from the Late Cretaceous of Europe
ABSTRACT Fossil soft-shelled turtles (Trionychidae) have so far been recognized in all continents except Antarctica, based largely on remains preserving their diagnostic sculptured shell bones. The…
Insights into the Taxonomy and Systematics of North American Eocene Soft-Shelled Turtles from a Well-Preserved Specimen
  • N. Vitek
  • Geography, Environmental Science
  • 2011
TLDR
A nearly complete fossil soft-shelled turtle from the Eocene Washakie Formation of Wyoming is described and identified as Oliveremys uintaensis, comb.
Phylogenetic relationships and divergence dates of softshell turtles (Testudines: Trionychidae) inferred from complete mitochondrial genomes
TLDR
The results of divergence time estimates and area ancestral reconstruction show that extant Trionychidae originated in Asia at around 108 million years ago (MA), and radiations mainly occurred during two warm periods, namely Late Cretaceous–Early Eocene and Oligocene.
Giant fossil soft-shelled turtles of North America
  • N. Vitek
  • Environmental Science, Biology
  • 2012
TLDR
Two new species are established and the taxon name ‘Axestemys’ is best defined phylogenetically as a stem-based clade rather than defined based on many of the characters traditionally ascribed to it, which are not consistently present throughout all species of Axstemys.
The shell morphology of the latest Cretaceous (Maastrichtian) trionychid turtle Helopanoplia distincta
TLDR
Shell remains of eight fossils referable to Helopanoplia distincta from the Hell Creek Formation of Montana and North Dakota are described that document nearly all aspects of the shell morphology of this taxon and place it as sister to the clade formed by Plastomenus thomasii and Hutchemys spp.
Lower Cretaceous fossils from China shed light on the ancestral body plan of crown softshell turtles (Trionychidae, Cryptodira)
TLDR
Results indicate that the primitive morphology for soft-shell turtles is a poorly ossified shell like that of crown-trionychines and that shell re-ossification in cyclanorbines (including re-acquisition of peripheral elements) is secondary.
A Divergence Dating Analysis of Turtles Using Fossil Calibrations: An Example of Best Practices
TLDR
This work provides the first explicitly justified minimum and soft maximum age constraints on 22 clades of turtles following best practice protocols and generates novel age-of-origination estimates for clades within crown Testudines.
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