[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]

Diamantinasaurus (titanosauriform sauropod from Cretaceous of Australia) redescribed



From: Ben Creisler
bcreisler@gmail.com


A new online paper:


Stephen F. Poropat, Paul Upchurch, Philip D. Mannion, Scott A.
Hocknull, Benjamin P. Kear, Trish Sloan, George H.K. Sinapius & David
A. Elliott (2014)
Revision of the sauropod dinosaur Diamantinasaurus matildae Hocknull
et al. 2009 from the mid-Cretaceous of Australia: Implications for
Gondwanan titanosauriform dispersal
Gondwana Research (advance online publication)
doi: http://dx.doi.org/10.1016/j.gr.2014.03.014
http://www.sciencedirect.com/science/article/pii/S1342937X14001051


The osteology of Diamantinasaurus matildae, the most complete
Cretaceous sauropod described from Australia to date, is
comprehensively reassessed. The preparation of additional material
from the type locality, pertaining to the same individual as the
holotype, sheds light on the morphology of the axial skeleton and
provides additional information on the appendicular skeleton. The new
material comprises two dorsal vertebrae, an incomplete sacrum
(including four partial coalesced vertebrae), the right coracoid, the
right radius, and a previously missing portion of the right fibula. In
this study we identify thirteen autapomorphic characters of
Diamantinasaurus, and an additional five characters that are locally
autapomorphic within Titanosauriformes. This work provided an
opportunity to revisit the phylogenetic placement of Diamantinasaurus.
In two independent data matrices, Diamantinasaurus was recovered
within Lithostrotia. One analysis resolved Diamantinasaurus as the
sister taxon to the approximately coeval Tapuiasaurus from Brazil,
whereas the second analysis recovered Diamantinasaurus as the sister
taxon to Opisthocoelicaudia from the latest Cretaceous of Mongolia.
The characters supporting the recovered relationships are analysed,
and the palaeobiogeographical implications of the lithostrotian status
of Diamantinasaurus, and of the body fossil record of Australian
Cretaceous terrestrial vertebrates as a whole, strongly suggest close
ties to South America in particular, and to Gondwana more generally.

Highlights
Diamantinasaurus matildae holotype is fully reassessed and new
material is described
Diamantinasaurus resolved in two phylogenetic analyses as a
lithostrotian titanosaur
Palaeobiogeographic implications of Diamantinasaurus as a
lithostrotian are explored
==