A New Dermatemydid (Testudines, Kinosternoidea) from the Paleocene-Eocene Thermal Maximum, Willwood Formation, Southeastern Bighorn Basin, Wyoming

  title={A New Dermatemydid (Testudines, Kinosternoidea) from the Paleocene-Eocene Thermal Maximum, Willwood Formation, Southeastern Bighorn Basin, Wyoming},
  author={Jason R. Bourque and JamesH. Hutchison and Patricia A. Holroyd and Jonathan I. Bloch},
ABSTRACT Gomphochelys nanus, new genus and species, is described from the earliest Wasatchian (biohorizon Wa 0; ∼55.8 Ma) of the southeastern Bighorn Basin, Washakie County, Wyoming. The new taxon represents the only known dermatemydid from the Paleocene—Eocene Thermal Maximum (PETM) interval and extends the lineage back from previous records by approximately 2 million years. Gomphochelys nanus has a thick tricarinate carapace and differs from other dermatemydids in attaining a smaller adult… 
A new Late Cretaceous iguanomorph from North America and the origin of New World Pleurodonta (Squamata, Iguania)
It is suggested that crown pleurodontans were restricted to the low-latitude Neotropics prior to their early Palaeogene first appearances in the mid-latitudes of North America, and a phylogenetic link between Campanian-age North American and East Asian stem iguanomorphs is revealed.
Yelmochelys rosarioae gen. et sp. nov., a stem kinosternid (t estudines; Kinosternidae) from the l ate Cretaceous of Coahuila, Mexico
A phylogenetic analysis concludes that Y. rosarioae is a representative of the stem lineage of the Kinosternidae and supports the hypothesis that KinostERNidae and Dermatemydidae had diverged by the Late Campanian.
A Review of the Fossil Record of Turtles of the Clade Pan-Kinosternoidea
Turtles of the total clade Pan-Kinosternoidea have a relatively poor fossil record that extends back to the Late Cretaceous, and a taxonomic review of the group concludes that of 42 named taxa, 27 are nomina valida, including two species of the controversial taxon Planetochelys.
Unappreciated Cenozoic ecomorphological diversification of stem gars revealed by a new large species
The skeleton of a new gar species from the Eocene Willwood Formation of Wyoming, USA is described, providing new information about the anatomy of this poorly known cranial region in cuneatins.
Side-Necked Turtles (Testudines, Pleurodira) from the Ancient Gulf Coastal Plain of Florida During Middle Cenozoic Megathermals
  • Jason R. Bourque
  • Environmental Science, Geography
    Chelonian Conservation and Biology
  • 2016
Pleurodire fossils from paleocoastal deposits in northwestern Florida are indicators that paleoclimate in the southeastern United States was frost free during the Eocene, LOW, and MMCO with air and water temperatures warm enough to support these generally cold-intolerant turtles.
Mitogenomic phylogeny and fossil-calibrated mutation rates for all F- and M-type mtDNA genes of the largest freshwater mussel family, the Unionidae (Bivalvia)
The phylogeny indicates that the clades Contradentini+Rectidentini and Lamprotulini+Pseudodontini+Gonideini split in the early Cretaceous (~125 Mya), and that the crown group of ContradENTini+ Rectidentini originated in the late Cret Jurassic (~79 Mya).
Evaluating the responses of three closely related small mammal lineages to climate change across the Paleocene–Eocene thermal maximum
Abstract. Interpreting the impact of climate change on vertebrates in the fossil record can be complicated by the effects of potential biotic drivers on morphological patterns observed in taxa. One


A new kinosternoid from the Late Cretaceous Hell Creek Formation of North Dakota and Montana and the origin of the Dermatemys mawii lineage
A nearly complete turtle shell from the Late Cretaceous (Maastrichtian) Hell Creek Formation of Slope County, North Dakota, represents the most complete remains to date of a Mesozoic kinosternoid
New fossils of the oldest North American euprimate Teilhardina brandti (Omomyidae) from the paleocene-eocene thermal maximum.
The hypothesis that Teilhardina originated in Asia and dispersed westward to Europe and then to North America during the earliest Eocene Paleocene-Eocene Thermal Maximum is most consistent with available evidence, including the relative age of fossil samples and their stage of evolution.
A New Small-Bodied Species of Palaeonictis (Creodonta, Oxyaenidae) from the Paleocene-Eocene Thermal Maximum
Results from a dietary analysis of Palaeonictis indicate that it was an omnivore that primarily consumed meat, suggesting that the decreased nutritious quality of vegetation caused by increased CO2 levels was not the direct contributing factor that caused body size reduction of this lineage during the PETM.
Early Kinosterninae (Reptilia: Testudines) and their phylogenetic significance
The morphology of the fossil forms bridges much of the morphological gap between the extant Kinosterninae and Staurotypinae.
A Fossil Mud Turtle (Testudines, Kinosternidae) from the Early Middle Miocene (Early Barstovian) of New Mexico
ABSTRACT The nearly complete skeleton of a mud turtle, Kinosternon skullridgescens, n. sp., is described from Santa Fe County, New Mexico. The specimen was collected from the early middle Miocene,
A new lizard assemblage from the earliest eocene (Zone Wa0) of the bighorn basin, wyoming, USA: Biogeography during the warmest interval of the cenozoic
Synopsis Despite two decades of research into the earliest Eocène fossils of the Rocky Mountain interior of North America, almost nothing is known of the squamates (lizards and snakes) from this
A recently discovered vertebrate fossil-bearing locality in the Fleming Formation of easternmost Texas has revealed a highly diverse fauna that contains a minimum of 44 early Miocene vertebrate taxa, document the rare preservation of a forested subtropical to tropical coastal lowland paleoenvironment and provide evidence to imply that separation into mid-continent and coastal plain paleobiogeographic provinces had not yet occurred.
Early Wasatchian Mammals of the Red Hot Local Fauna, Uppermost Tuscahoma Formation, Lauderdale County, Mississippi
Several lines of evidence suggest that the Red Hot local fauna correlates with earliest Wasatchian (Wa-M) faunas from the Bighorn Basin of Wyoming, consistent with evidence for substantive differences in the physical environment and flora.
Palaeoecology of a primate-friendly, middle Eocene community from Laredo, Texas and a review of stratigraphic occurrences of Paleogene land mammals across the Gulf Coastal Plain, USA
  • James W. Westgate
  • Environmental Science, Geography
    Palaeobiodiversity and Palaeoenvironments
  • 2012
Recent analysis of primate remains in the Casa Blanca local fauna from the late middle Eocene Laredo Formation at Laredo, Texas has shown that the fauna’s primate species diversity was greater than
New record of anthracotheriidae (Artiodactyla: Mammalia) from the middle eocene yegua formation (Claiborne Group), Houston County, Texas
A small new species of the anthracotheriid artiodactyl genus Heptacodon is described from the middle Eocene Yegua Formation from a site near Lovelady, Houston County, Texas.