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A new species of Palatobaena (Testudines: Baenidae) and a maximum parsimony and Bayesian phylogenetic analysis of Baenidae

  • Tyler R. Lyson (a1) (a2) and Walter G. Joyce (a3) (a4)
Abstract

New Palatobaena material from the Hell Creek Formation (Maastrichtian), including the first skull and shell association, from southwestern North Dakota represents a new species named herein Palatobaena cohen. the material consists of 4 skulls, 2 lower jaws, and 2 shells and represents a true biological population (spatially and temporally restricted), which provides unprecedented access to ontogenetic and other intraspecific variation found in this taxon. the skull's round shape and lack of a lingual ridge on the greatly expanded triturating surface indicate its Palatobaena affinities, but it differs from both previously existing Palatobaena taxa in a number of features. the addition of shell characters to the most inclusive baenid phylogenetic analyses (Maximum parsimony and Bayesian) to date indicate that Pa. cohen is sister taxon to the other Palatobaena taxa. Notably, both the maximum parsimony analysis and Bayesian analysis provide strong support for Plesiobaena antiqua as sister to the Palatobaena clade. in addition, both analyses provide strong support for Stygiochelys estesi as sister to the Eocene clade of Baena arenosa and Chisternon undatum, which significantly reduces this clades' ghost lineage. the baenid topology reveals a demonstrably homoplastic trend towards the reduction of the temporal emargination and unique thickening of the posterior portion of the parietals that corresponds with the K/T boundary and is hypothesized to have provided limited protection from increasingly effective mammalian predators.

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D. B. Brinkman 2003. Anatomy and systematics of Plesiobaena antiqua (Testudines: Baenidae) from the mid-Campanian Judith River Group of Alberta, Canada. Journal of Vertebrate Paleontology, 23:146155.

D. B. Brinkman and E. L. Nicholls 1991. Anatomy and relationships of the turtle Boremys pulchra (Testudines: Baenidae). Journal of Vertebrate Paleontology, 11:302315.

D. B. Brinkman and E. L. Nicholls 1993. The skull of Neurankylus eximius (Testudines: Baenidae) and a reinterpretation of the relationships of this taxon. Journal of Vertebrate Paleontology, 13:273281.

J. M. Clarke and K. M. Middleton 2008. Mosaicism, modules, and the evolution of birds: Results from a Bayesian approach to the study of morphological evolution using discrete character data. Systematic Biology, 57(2):185201.

J. Felsenstein 1985. Confidence limits on phylogenies: An approach using the bootstrap. Evolution, 39:783791.

C. W. Gilmore 1935. On the Reptilia of the Kirtland Formation of New Mexico, with descriptions of new species of fossil turtles. Proceedings U.S. National Museum, 83:159188.

D. M. Hillis and J. J. Bull 1993. An empirical test of bootstrapping as a method for assessing confidence in phylogenetic analysis. Systematic Biology, 42:182192.

J. H. Hutchison 1982. Turtle, crocodilian, and champsosaur diversity changes in the Cenozoic of the north central region of western United States. Palaeogeography, Palaeoclimatology, Palaeoecology, 37:147164.

J. H. Hutchison 1984. Determinate growth in the Baenidae (Testudines): Taxonomic, ecologic and stratigraphic significance. Journal of Vertebrate Paleontology, 3:148151.

J. H. Hutchison 2005. A new Eubaenine, Goleremys mckennai, gen. et sp. n., (Baenidae: Testudines) from the Paleocene of California. Bulletin of the Carnegie Museum of Natural History, 36:9196.

J. H. Hutchison and J. D. Archibald 1986. Diversity of turtles across the Cretaceous/Tertiary Boundary in northeastern Montana. Palaeogeography, Palaeoclimatology, Palaeoecology, 55:122.

J. H. Hutchison and P. A. Holroyd 2003. Late Cretaceous and Early Paleocene turtles of the Denver Basin, Colorado. Rocky Mountain Geology, 38(1):121142.

W. G. Joyce 2007. Phylogenetic relationships of Mesozoic turtles. Bulletin of the Peabody Museum of Natural History, 48(1):3102.

P. O. Lewis 2001. A likelihood approach to estimating phylogeny from discrete morphological character data. Systematic Biology, 50:913925.

F. Ronquist and J. P. Huelsenbeck 2003. MrBayes 3: Bayesian phylogenetic inference under mixed models. Bioinformatics, 19:15721574.

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Journal of Paleontology
  • ISSN: 0022-3360
  • EISSN: 1937-2337
  • URL: /core/journals/journal-of-paleontology
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