+ Site Statistics
References:
52,654,530
Abstracts:
29,560,856
PMIDs:
28,072,755
+ Search Articles
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ PDF Full Text
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn
+ Translate
+ Recently Requested

A new genus of cryptodiran turtles Testudinoidea, Chelydridae from the Upper Cretaceous Hell Creek formation of Montana



A new genus of cryptodiran turtles Testudinoidea, Chelydridae from the Upper Cretaceous Hell Creek formation of Montana



University of Kansas Science Bulletin, 5117: 539-563



EMARGINACHELYS cretacea is described as a new genus and species of cryptodiran turtle and is placed in the Chelydridae on the basis of shared derived characters. The holotype is a nearly complete skeleton from the Hell Creek formation (Maestrichtian) of Montana USA . Emarginachelys is the oldest known member of the superfamily Testudinoidea as defined by Gaffney (1975). The Chelydridae are hypothesized to be a monophyletic group, sharing a cruciform plastron ligamentously attached to the carapace, a reduced endoplastron, long costiform processes on the nuchal bone, an elongate jugal and the pectineal processes of the pubis not strongly divergent. Emarginachelys is hypothesized to be the most primitive genus of the Chelydridae since it does not have the derived characters shared by advanced chelydrids. Advanced chelydrids have the frontal bones separated from the orbital rim, a premaxillary hook, constriction of the otic bridge, a closed incisura columella auris, a serrated carapacial margin and peripheral fontanelles.

(PDF emailed within 1 workday: $29.90)

Accession: 037631665

Download citation: RISBibTeXText


Related references

A new genus of cryptodiran turtles testudinoidea chelydridae from the upper cretaceous hell creek formation of montana usa. University of Kansas Science Bulletin 51(17): 539-563, 1978

Palynologically defined Cretaceous Bug Creek facies channel, Upper Hell Creek Formation, McCone County, N.E. Montana. Abstracts with Programs - Geological Society of America 20(6): 428, 1988

Crocodile population structure in the upper Cretaceous Hell Creek Formation, eastern Montana. 2007

The possible role of climate on successive turtle assemblages from the Upper Cretaceous Hell Creek Formation, Montana. Journal of Vertebrate Paleontology 24(3, Suppl, 2004

Sedimentology and taphonomy of a shell bed assemblage from the Upper Cretaceous Hell Creek Formation of eastern Montana. North American Paleontological Convention 9: 339-340, 2009

Palynology of the upper Cretaceous and lower Tertiary in the type locality of the Hell Creek Formation, Montana, U.S.A. Palaeontographica Abteilung B: Palaeophytologie, 1969

A probable tyrannosaurid track from the Hell Creek Formation Upper Cretaceous, Montana, United States. Palaios 23(10): 645-647, 2008

Reworking of Cretaceous dinosaurs into Paleocene channel deposits, upper Hell Creek Formation, Montana. Geology (Boulder): 189: 874-877, 1990

Measuring fossil reworking within a fluvial system; an example from the Hell Creek Formation (Upper Cretaceous) of eastern Montana. National Science Museum Monographs 14: 243-251, 1998

A New Specimen of the Controversial Chasmosaurine Torosaurus latus (Dinosauria: Ceratopsidae) from the Upper Cretaceous Hell Creek Formation of Montana. Plos One 11(3): E0151453-E0151453, 2016

Preliminary report of a significant assemblage of baenid turtles from the Upper Cretaceous (Maestrichtian) Hell Creek Formation of southwestern North Dakota. Journal of Vertebrate Paleontology 24(3, Suppl, 2004

Paleoenvironmental controls on modes of extraordinary vertebrate fossil preservation, Upper Cretaceous Hell Creek Formation, northeast Montana. Journal of Vertebrate Paleontology 22(3 Supplement): 104A, 19 September, 2002

Environmental-stratigraphic relationships of the Upper Cretaceous Fox Hills and Hell Creek formations and Paleocene Fort Union Formation in northeastern Montana. Abstracts with Programs - Geological Society of America 12(6): 278, 1980

Dinosaur census reveals abundant Tyrannosaurus and rare ontogenetic stages in the Upper Cretaceous Hell Creek Formation (Maastrichtian), Montana, USA. Plos One 6(2): E16574-E16574, 2012

Dinosaur census reveals abundant Tyrannosaurus and rare ontogenetic stages in the Upper Cretaceous Hell Creek Formation Maastrichtian, Montana, USA. PloS One, 2011