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Australodocus a titanosauriform and other new papers



From: Ben Creisler
bh480@scn.org

Some new papers:

John A. Whitlock (2011)
Re-evaluation of Australodocus bohetii, a putative diplodocoid sauropod
from the Tendaguru Formation of Tanzania, with comment on Late Jurassic
sauropod faunal diversity and palaeoecology.
Palaeogeography, Palaeoclimatology, Palaeoecology (advance online
publication)
doi:10.1016/j.palaeo.2011.07.001
http://www.sciencedirect.com/science/article/pii/S0031018211003579
 
The Late Jurassic sauropod Australodocus bohetii was originally assigned to
Diplodocidae, primarily on the basis of bifurcate neural spines. The
holotype and paratype materials of A. bohetii are re-examined and found to
have closer affinities with Brachiosaurus and relatives than with any
diplodocoid. The presence of a second titanosauriform sauropod in the
Tanzanian fauna is important for understanding the palaeoecology of the
region. Comparisons between Tendaguru and three other contemporaneous
sauropod faunas (Morrison Formation, USA; Lourinhã and Alcobaça formations,
Portugal; Cañadón Calcáreo, Argentina) are also made. The revised Tendaguru
fauna, with its high diversity of high-browsing Macronarians, now more
closely matches the conifer-forest dominated landscape inferred from
palaeobotanical evidence. The Morrison Formation, dominated by low-browse,
is once again the only formation containing multiple diplodocids.

Andrea Cau, Fabio Marco Dalla Vecchia, and Matteo Fabbri (2011)
Evidence of a new carcharodontosaurid from the Upper Cretaceous of Morocco.
Acta Palaeontologica Polonica (in press)
doi:10.4202/app.2011.0043
http://app.pan.pl/article/item/app20110043.html

We report an isolated frontal of a large-bodied theropod from the
Cenomanian ?Kem Kem beds? of Morocco with an unusual morphology that we
refer to a new carcharodontosaurid distinct from the sympatric
Carcharodontosaurus. The specimen shows an unique combination of
plesiomorphic and potentially autapomorphic features: very thick and broad
bone with a complex saddle-shaped dorsal surface, and a narrow vertical
lamina between the prefrontal and lacrimal facets. This study supports the
hypothesis that a fourth large theropod was present in the Cenomanian of
Morocco together with Carcharodontosaurus, Deltadromeus and Spinosaurus.


Christian F. Kammerer, Sterling J. Nesbitt, and Neil H. Shubin (2011)
The first basal dinosauriform (Silesauridae) from the Late Triassic of
Morocco.
Acta Palaeontologica Polonica (in press)
doi:10.4202/app.2011.0015
http://app.pan.pl/article/item/app20110015.html


Disarticulated material from the Late Triassic Timezgadiouine Formation in
the Argana Basin of Morocco represents a new taxon of silesaurid
dinosauromorph, Diodorus scytobrachion gen. et sp. nov. D. scytobrachion
can be distinguished from other silesaurids by the presence of
anteriorly-canted teeth that decrease in size towards the anterior end of
the dentary and a distinct lateral ridge running parallel to the dentary
alveolar margin. In a phylogenetic analysis, D. scytobrachion is recovered
as the sistertaxon to the Brazilian Sacisaurus agudoensis, nested deep
within Silesauridae. This new taxon provides further evidence of a
near-cosmopolitan range for basal dinosauriforms in the Late Triassic and
further demonstrates the disparity of dental morphologies within
Silesauridae.




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