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

Re: Mapusaurus roseae & Antarctopelta oliveroi



To stop people from going crazy, and to partially stop the tide of emails i've 
been getting in the
last 5 hours: HERE ARE THE PDF LINKS.

Antarctopelta
Salgado L. & Gasparini Z. 2006. ? Reappraisal of an ankylosaurian dinosaur from 
the Upper
Cretaceous of James Ross Island (Antarctica). Geodiversitas 28 (1) : 119-135.
http://www.mnhn.fr/museum/front/medias/publication/7654_g06n1a5.pdf
ABSTRACT:
The holotype of the upper Campanian ankylosaur Antarctopelta oliveroi n. gen., 
n. sp., from James
Ross Island, Antarctica, is described. Diagnostic characters include short 
cervicals (centrum
length about 70% of the centrum height), distal caudal vertebrae with 
transverse processes well
developed (centrum width including the transverse processes exceeds 30% of the 
posterior
articulation width) and dorsoventrally depressed, and the presence of smooth, 
sub-circular
osteoderms, surrounded by a mosaic of smaller polygonal osteoderms with a 
rugose surface texture
and tiny, button-like ossicles. While a number of features, such as relatively 
large teeth with
respect to the mandible and the presence of an asymmetrical cingulum, suggest 
an affinity with the
Nodosauridae, others such as the dorsoventrally depressed morphology of the 
distal caudal
vertebrae and, especially, the presence of ossified tendons on their ventral 
side, characterize
the Ankylosauridae. This uncertainty impedes evaluation of the 
paleobiogeographical significance
of this new species of dinosaur.

Mapusaurus
Coria R. A. & Currie P. J. 2006. ? A new carcharodontosaurid (Dinosauria, 
Theropoda) from the
Upper Cretaceous of Argentina. Geodiversitas 28 (1) : 71-118.
http://www.mnhn.fr/museum/front/medias/publication/7653_g06n1a4.pdf
ABSTRACT
A new carcharodontosaurid theropod from the Huincul Formation 
(Aptian-Cenomanian, Upper
Cretaceous) of Neuquén Province, Argentina, is described. Approximately the 
same size as
Giganotosaurus carolinii Coria & Salgado, 1995, Mapusaurus roseae n. gen., n. 
sp. is characterized
by many features including a deep, short and narrow skull with relatively large 
triangular
antorbital fossae,
relatively small maxillary fenestra, and narrow, unfused rugose nasals. 
Mapusaurus roseae n. gen.,
n. sp. has cervical neural spines and distally tapering epipophyses, tall 
dorsal neural spines,
central pleurocoels as far back as the first sacral vertebra, accessory caudal 
neural spines,
stout humerus with poorly defined distal condyles, fused metacarpals, ilium 
with brevis fossa
extending deeply into
ischial peduncle, and femur with low fourth trochanter. Phylogenetic analysis 
indicates that
Mapusaurus n. gen. shares with Carcharodontosaurus Stromer, 1931 and 
Giganotosaurus Coria &
Salgado, 1995 several derived features that include narrow blade-like teeth 
with wrinkled enamel,
heavily sculptured facial bones, supraorbital shelf formed by a 
postorbital/palpebral complex, and
a dorsomedially directed femoral head. Remains of Mapusaurus n. gen. were 
recovered from a bonebed
where 100% of the identifiable dinosaur bones can be assigned to this new 
genus. Based on the
metatarsals recovered, a minimum of seven individuals was buried at the site. 
It is conceivable
that this bonebed represents a long term or coincidental accumulation of 
carcasses. The presence
of a single carnivorous taxon with individuals of different ontogenic stages 
provides evidence of
variation within a single population, and may also indicate some behavioural 
traits for Mapusaurus
roseae n. gen., n. sp.

--- Nick Pharris <npharris@umich.edu> wrote:

> Quoting Jay <sappororaptor@yahoo.com>:
> 
> > Mapusaurus
> >
> > Coria R. A. & Currie P. J. 2006. ? A new carcharodontosaurid 
> > (Dinosauria, Theropoda) from the
> > Upper Cretaceous of Argentina. Geodiversitas 28 (1) : 71-118.
> 
> > Antarctopelta
> > Salgado L. & Gasparini Z. 2006. ? Reappraisal of an ankylosaurian 
> > dinosaur from the Upper
> > Cretaceous of James Ross Island (Antarctica). Geodiversitas 28 (1) : 
> > 119-135.
> 
> Argh!  Geodiversitas is one of the relatively few journals U of M 
> doesn't get in electronic format.  Does any kind soul out there have 
> .pdfs?
> 
> -- 
> Nick Pharris
> Department of Linguistics
> University of Michigan
> 
> "Creativity is the sudden cessation of stupidity."
>      --Edwin H. Land
> 


__________________________________________________
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around 
http://mail.yahoo.com