Chinlechelys from the Upper Triassic of New Mexico, USA, and the origin of turtles

@article{Lichtig2021ChinlechelysFT,
  title={Chinlechelys from the Upper Triassic of New Mexico, USA, and the origin of turtles},
  author={Asher Lichtig and S. Lucas},
  journal={Palaeontologia Electronica},
  year={2021},
  volume={24},
  pages={1-49}
}
Chinlechelys tenertesta is a turtle from the Upper Triassic Bull Canyon Formation of the Chinle Group of eastern New Mexico, USA, which has largely been ignored in recent studies of the phylogenetic position of turtles (Testudinata) within the Tetrapoda. Here, we present the first comprehensive description of the morphology of Chinlechelys tenertesta and reaffirm its unequivocal support for the composite model of costal bone formation in turtles. We also document the presence in Chinlechelys… Expand
1 Citations
Morphology of the temporal skull region in tetrapods: research history, functional explanations, and a new comprehensive classification scheme
TLDR
A novel comprehensive classification scheme for the various temporal morphotypes in all Tetrapoda that is independent of phylogeny and previous terminology is introduced that may facilitate morphological comparisons in future studies. Expand

References

SHOWING 1-10 OF 126 REFERENCES
An ancestral turtle from the Late Triassic of southwestern China
TLDR
A new 220-million-year-old turtle from China is described that documents an intermediate step in the evolution of the shell and associated structures and shows that the turtle shell is not derived from a fusion of osteoderms. Expand
Microanatomy of the stem-turtle Pappochelys rosinae indicates a predominantly fossorial mode of life and clarifies early steps in the evolution of the shell
TLDR
Bone histological evidence reveals evolutionary changes in bone microstructure in ribs and gastralia approaching the turtle condition and evidence for a predominantly amphibious or fossorial mode of life in Pappochelys, which support the hypothesis that crucial steps in the evolution of the shell occurred in a terrestrial rather than fully aquatic environment. Expand
A thin-shelled reptile from the Late Triassic of North America and the origin of the turtle shell
TLDR
The novel observations of Chinlechelys tenertesta lend support to the hypothesis that the turtle shell was originally a complex composite in which dermal armour fused with the endoskeletal ribs and vertebrae of an ancestral lineage instead of forming de novo. Expand
Osteology of the Middle Triassic stem-turtle Pappochelys rosinae and the early evolution of the turtle skeleton
TLDR
A phylogenetic analysis using a modified character-taxon matrix from a recent study to assess the placement of Pappochelys among amniotes found it to nest among Pantestudines with Eunotosaurus and the more derived Odontochelys and Proganochelys. Expand
Revision of the Triassic European turtles Proterochersis and Murrhardtia (Reptilia, Testudinata, Proterochersidae), with the description of new taxa from Poland and Germany
TLDR
New discovered plesiomorphic aspects of the anatomy of these three species included in the phylogenetic analysis demonstrate that they are not only the oldest, but are also the most basal fully shelled turtles. Expand
A Middle Triassic stem-turtle and the evolution of the turtle body plan
TLDR
A new reptile, Pappochelys, is reported that is structurally and chronologically intermediate between Eunotosaurus and Odontochelys and dates from the Middle Triassic period (∼240 million years ago), providing new evidence that the plastron partly formed through serial fusion of gastralia. Expand
A Review of the Fossil Record of Basal Mesozoic Turtles
  • W. Joyce
  • Biology
  • Bulletin of the Peabody Museum of Natural History
  • 2017
TLDR
Sedimentological, anatomical, and histological data universally hint at terrestrial habitat preference among the earliest stem turtles, but a more mixed, though unambiguously continental signal is apparent further towards the crown. Expand
Oedaleops campi (Reptilia: Pelycosauria) New Genus and Species from the Lower Permian of New Mexico, and the Family Eothyrididae
  • 2009
A small Lower Permian pelycosaur, Oedaleops n. gen., is known from some skulls and associated dentarv bones from the Cutler Formation of Rio Arriba County, ~ew Mexico. The new species O. campi isExpand
Anatomy and Relationships of the Middle Permian Varanopid Heleosaurus scholtzi Based on a Social Aggregation from the Karoo Basin of South Africa
TLDR
Phylogenetic analysis of Varanopidae using an augmented data matrix from the literature positions Heleosaurus as the sister taxon of Elliotsmithia within the varanopid subfamily Mycterosaurinae, and both this sister-group relationship and the monophyly of MyCTerosaurinee are weak and collapse with one extra step. Expand
A New Baenid Turtle from the Upper Cretaceous (Maastrichtian) Hell Creek Formation of North Dakota and a Preliminary Taxonomic Review of Cretaceous Baenidae
TLDR
A fragmentary skull from the Hell Creek Formation of southwestern North Dakota represents a new taxon of baenid turtle named herein Gamerabaena sonsalla, which has several morphological features that are intermediate between Plesiobaena antiqua and the morphologically disparate Palatobaena spp. Expand
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