Chubutemys, a New Eucryptodiran Turtle from the Early Cretaceous of Argentina, and the Relationships of the Meiolaniidae

By E. Gaffney, T. Rich, P. Rich, A. Constantine, Raul Vacca, L. Kool. 2007

103 citations recorded by the source corpus.

Abstract Chubutemys copelloi is the oldest nonmarine cryptodire from South America represented by a skull. The skull and associated postcranial fragments are from the Aptian Cerro Costano Member of the Cerro Barcino Formation of Chubut, Argentina. Chubutemys has a processus trochlearis oticum, showing that it is a cryptodire, and an enclosed canalis caroticus internus extending to the posterior margin of the pterygoid, showing that it is a eucryptodire. The skull of Chubutemys is similar to that of other primitive eucryptodires, particularly Dracochelys, but also to Hangaiemys, Judithemys, Sinemys, and Ordosemys. Chubutemys differs from all these, however, in possessing a solidly roofed skull, formed by long, wide parietals, rather than a posterior emargination. Chubutemys also differs from these taxa in having no cheek emargination. A phylogenetic analysis using PAUP* analyzed 104 parsimony-informative characters resolving into one most parsimonious cladogram of 224 steps, a consistency index of 0.55, an...

Subfields: Global and Planetary Change, Paleontology

View Paper: https://www.semanticscholar.org/paper/f283ca5e3fe8cedb70b7682b52ba353c08894722

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Citations in the corpus

A Divergence Dating Analysis of Turtles Using Fossil Calibrations: An Example of Best Practices (2013, background): “…Proterochersis robusta Fraas, 1913 has been argued traditionally to be the oldest known representatives of the pleurodire lineage (Fraas, 1913; Gaffney et al., 2007), but it has been interpreted more recently as a stem-turtle (e.g., Rougier et al., 1995; Danilov and Parham, 2006; Joyce, 2007;…”
A Review of the Fossil Record of Basal Mesozoic Turtles (2017, methodology): “The cranial anatomy of Cretaceous stem turtles is finally known for Chubutemys copelloi (Gaffney et al. 2007; Sterli et al. 2015), Helochelydra nopcsai (Joyce et al. 2011), Kallokibotion bajazidi (Gaffney and Meylan 1992), Mongolochelys efremovi (Khosatzky 1997; Sukhanov 2000; Suzuki and Chinzorig…”
Reassessment of the phylogenetic interrelationships of basal turtles (Testudinata) (2012, background): “has been followed by subsequent workers (Hirayama et al. 2000; Gaffney et al. 2007) and here.”