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Re: Rukwatitan, new titanosaur from Cretaceous of Tanzania (free pdf)

Note that the pdf is now free in open access....


On Tue, Sep 9, 2014 at 7:05 AM, Ben Creisler <bcreisler@gmail.com> wrote:
> Ben Creisler
> bcreisler@gmail.com
> Here's the full ref in the new JVP:
> Eric Gorscak, Patrick M. O'Connor, Nancy J. Stevens & Eric M. Roberts (2014)
> The basal titanosaurian Rukwatitan bisepultus (Dinosauria, Sauropoda)
> from the middle Cretaceous Galula Formation, Rukwa Rift Basin,
> southwestern Tanzania.
> Journal of Vertebrate Paleontology 34(5): 1133-1154
> DOI:10.1080/02724634.2014.845568
> http://www.tandfonline.com/doi/full/10.1080/02724634.2014.845568#.VA8HDvldXTo
> Whereas titanosaurians represent the most diverse and cosmopolitan
> clade of Cretaceous sauropod dinosaurs, they remain rare components of
> Cretaceous African faunas. Currently recognized continental African
> titanosaurians include Aegyptosaurus baharijensis and Paralititan
> stromeri from early Upper Cretaceous deposits near Bahariya Oasis,
> Egypt, and Malawisaurus dixeyi and Karongasaurus gittelmani from the
> Lower Cretaceous (∼Aptian) Dinosaur Beds of Malawi, in addition to
> several undesignated and fragmentary forms across the continent. Here,
> we describe a new titanosaurian taxon, Rukwatitan bisepultus, on the
> basis of a partial, semiarticulated postcranial skeleton recovered
> from the middle Cretaceous Galula Formation in southwestern Tanzania.
> Unique to Rukwatitan are carotid processes on posterior cervical
> vertebrae, a deep coracobrachialis fossa and subquadrangular
> cross-section of the humerus, and a slender, curved, teardrop-shaped
> pubic peduncle on the ilium. Parsimony and Bayesian phylogenetic
> analyses of 35 sauropod taxa congruently place Rukwatitan as a
> non-lithostrotian titanosaurian, a relationship supported by cervical
> vertebrae with undivided pleurocoels and strongly procoelous anterior
> caudal vertebrae. Rukwatitan differs from the potentially
> penecontemporaneous and geographically proximate Malawisaurus by
> exhibiting weakly developed chevron articulations and posteriorly
> inclined neural spines on the middle caudal vertebrae, a proximally
> robust and distally unexpanded humerus, and an anteroventrally
> elongated coracoid. Similar to biogeographic patterns identified in
> certain crocodyliform clades (e.g., small-bodied notosuchians),
> titanosaurians on continental Africa appear to exhibit a regional
> (e.g., southern versus northern Africa), rather than a continental- or
> supercontinental-level signal.
> ---------- Forwarded message ----------
> From: Ben Creisler <bcreisler@gmail.com>
> Date: Mon, Sep 8, 2014 at 12:13 PM
> Subject: Rukwatitan, new titanosaur from Cretaceous of Tanzania (news)
> To: dinosaur@usc.edu
> Ben Creisler
> bcreisler@gmail.com
> The official paper in the new Journal of Vertebrate Paleontology is
> not yet online, but a number of news stories are out about a new
> titanosaur Rukwatitan bisepultus found in Tanzania:
> http://phys.org/news/2014-09-species-titanosaurian-dinosaur-tanzania.html
> http://news.discovery.com/animals/dinosaurs/another-massiv-new-dinosaur-found-this-time-in-africa-140908.htm