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Re: Arvinachelys, new turtle from Kaiparowits Formation (Upper Cretaceous) of Utah



The pdf is now free:

http://www.tandfonline.com/doi/pdf/10.1080/02724634.2015.1009084

On Wed, Oct 21, 2015 at 11:44 AM, Ben Creisler <bcreisler@gmail.com> wrote:
> Ben Creisler
> bcreisler@gmail.com
>
>
> Here's the paper (already mentioned in a news link posted today):
>
> Joshua R. Lively (2015)
> A new species of baenid turtle from the Kaiparowits Formation (Upper
> Cretaceous, Campanian) of southern Utah.
> Journal of Vertebrate Paleontology (advance online publication)
> DOI:10.1080/02724634.2015.1009084
> http://www.tandfonline.com/doi/full/10.1080/02724634.2015.1009084
>
> Newly discovered baenid turtle specimens from the middle Campanian
> Kaiparowits Formation of southern Utah are described herein as a new
> taxon, Arvinachelys goldeni, gen. et sp. nov. The holotype consists of
> a nearly complete articulated skeleton and shell. The skull was
> scanned using micro-computed tomography (μCT) to gain a better
> understanding of its internal anatomy. This baenid possesses two
> distinct external nares almost completely separated by a dorsal
> projection of the premaxillae and a ventral extension of the nasals,
> an autapomorphic feature among known baenid taxa. The skull is
> wedge-shaped with a broad rostrum and laterally expanded nasals. The
> importance of skull/shell associations is exemplified by Arvinachelys
> goldeni, because isolated shells attributable to this taxon had
> previously been assigned to the genus Plesiobaena, whereas
> phylogenetic analysis of more complete material supports a sister
> relationship with the Maastrichtian taxon Hayemys latifrons. These
> taxa are relatively basal within the Baenodda, a nested clade within
> Baenidae. The general shell morphology exhibited by Plesiobaena
> antiqua, Peckemys brinkman, and Palatobaena cohen was previously
> hypothesized to support a monophyletic clade that included those three
> taxa, along with Cedrobaena putorius, Gamerabaena sonsalla,
> Palatobaena bairdi, and Palatobaena gaffneyi. However, the inclusion
> of Arvinachelys goldeni, gen. et sp. nov., in a phylogenetic analysis
> of Baenidae indicates that the character states exhibited by those
> taxa are representative of plesiomorphic states within Baenodda, and
> the phylogenetic relationships within this clade are in need of
> reevaluation.
>
> http://zoobank.org/urn:lsid:zoobank.org:pub:A5C5717C-4962-4056-8563-2C90C3276FDF