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

Re: Australian spinosaur ref and other new papers



2nd try:

http://rsbl.royalsocietypublishing.org/content/early/2011/06/16/rsbl.2011.0466.full.pdf+html

Cheers, Michael
-------- Original-Nachricht --------
> Datum: Tue, 21 Jun 2011 19:37:52 +0200
> Von: "Michael Lange" <Michael.Lange@gmx.ch>
> An: dinosaur@usc.edu
> Betreff: Re: Australian spinosaur ref and other new papers

> It should be noticed that the spinosaur paper is for free. Pdf is
> available here: 
> 
> http://rsbl.royalsocietypublishing.org/content/early/2011/06
> 
> Cheers, Michael
> 
> -------- Original-Nachricht --------
> > Datum: Tue, 21 Jun 2011 12:55:49 -0400
> > Von: "bh480@scn.org" <bh480@scn.org>
> > An: dinosaur@usc.edu
> > Betreff: Australian spinosaur ref and other new papers
> 
> > From: Ben Creisler
> > bh480@scn.org
> > 
> > This find was mentioned already in news stories but the paper is now
> > available officially:
> > 
> > Paul M. Barrett, Roger B. J. Benson, Thomas H. Rich, and Patricia
> > Vickers-Rich (2011)
> > First spinosaurid dinosaur from Australia and the cosmopolitanism of
> > Cretaceous dinosaur faunas.
> > Biology Letters (advance online publication)
> > Published online before print June 21, 2011, 
> > doi: 10.1098/rsbl.2011.0466 
> >
> http://rsbl.royalsocietypublishing.org/content/early/2011/06/16/rsbl.2011.04
> > 66.abstract
> > 
> > A cervical vertebra from the Early Cretaceous of Victoria represents the
> > first Australian spinosaurid theropod dinosaur. This discovery
> > significantly extends the geographical range of spinosaurids, suggesting
> > that the clade obtained a near-global distribution before the onset of
> > Pangaean fragmentation. The combined presence of spinosaurid,
> > neovenatorid,
> > tyrannosauroid and dromaeosaurid theropods in the Australian Cretaceous
> > undermines previous suggestions that the dinosaur fauna of this region
> was
> > either largely endemic or predominantly ‘Gondwanan’ in composition.
> > Many
> > lineages are well-represented in both Laurasia and Gondwana, and these
> > observations suggest that Early-‘middle’ Cretaceous theropod clades
> > possessed more cosmopolitan distributions than assumed previously, and
> > that
> > caution is necessary when attempting to establish palaeobiogeographic
> > patterns on the basis of a patchily distributed fossil record. 
> > 
> > 
> > Federico L. Agnolin and Fernando E. Novas (2011)
> > A carpometacarpus from the Upper Cretaceous of Patagonia sheds light on
> > the
> > Ornithurine bird radiation. 
> > Paläontologische Zeitschrift (advance online publication)
> > DOI: 10.1007/s12542-011-0112-2 
> > http://www.springerlink.com/content/7t341u1342674858/
> > 
> > We report the discovery of an isolated avian carpometacarpus from the
> > Upper
> > Cretaceous Allen Formation (Campanian-Maastrichtian), Salitral Moreno,
> > Río
> > Negro Province, Argentina. This specimen is referred to cf. Neornithes
> > because it presents a distinct but shallow infratrochlear fossa, a
> > shortened ventral rim of the carpal trochlea that does not contact the
> > base
> > of the extensor process, and an extensor process conspicuously
> surpassing
> > cranially the articular facet for digit I. The isolated nature of the
> > specimen precludes its inclusion within the main neornithine lineages.
> > Although it may represent part of the crown clade Neornithes, the
> limited
> > data available do not confidently support placement within any
> particular
> > lineage. The carpometacarpus constitutes one of the few records of
> > Mesozoic
> > Neornithine-like birds for South America. 
> > 
> > 
> > The pdf is free for this one:
> > 
> > Jason R. Ali & David W. Krause
> > Late Cretaceous bioconnections between Indo-Madagascar and Antarctica:
> > refutation of the Gunnerus Ridge causeway hypothesis.
> > Journal of Biogeography (advance online publication)
> > DOI: 10.1111/j.1365-2699.2011.02546.x
> >
> http://onlinelibrary.wiley.com/doi/10.1111/j.1365-2699.2011.02546.x/abstract
> > 
> > Abstract
> > Aim To evaluate the Gunnerus Ridge land-bridge hypothesis, which
> > postulates
> > a Late Cretaceous causeway between eastern Antarctica and southern
> > Madagascar allowing the passage of terrestrial vertebrates.
> > 
> > Location Eastern Antarctica, southern Indian Ocean, Madagascar.
> > 
> > Methods The review involves palaeogeographical modelling, which draws
> upon
> > geological and geophysical data, bathymetric charts, and plate tectonic
> > reconstructions, and the evaluation of stratigraphically calibrated
> > phylogenetic analyses to document ghost lineages of select taxa.
> > 
> > Results The available geological and geophysical evidence indicates that
> > eastern Antarctica’s Gunnerus Ridge and southern Madagascar were
> > separated
> > for the entire Late Cretaceous by a vast marine expanse. In the
> mid–Late
> > Cretaceous, the gap was probably punctuated by land on two intervening
> > physiographical highs, the northern Madagascar Plateau and Conrad Rise,
> > the
> > latter of which, although probably large, was still separated from
> > Antarctica’s Riiser-Larsen Peninsula by c. 1600 km. Recent,
> > stratigraphically calibrated phylogenies including large, terrestrial
> > end-Cretaceous vertebrate taxa of Madagascar and the Indian subcontinent
> > reveal long ghost lineages that extended into the Early Cretaceous.
> > 
> > Main conclusions The view that Antarctica and Madagascar were connected
> by
> > a long causeway between the Gunnerus Ridge and southern Madagascar in
> the
> > Late Cretaceous, and that terrestrial vertebrates were able to colonize
> > new
> > frontiers using this physiographical feature, is almost certainly
> > incorrect, as was previously demonstrated for the purported causeway
> > between Antarctica and the Indian subcontinent across the Kerguelen
> > Plateau. Connection across mainland Africa to account for the close
> > relationships of several fossil and extant vertebrate taxa of
> > Indo-Madagascar and South America is another option, although this too
> > lacks credibility. We conclude that (1) throughout the Late Cretaceous
> > there was no intervening, continuous causeway through Antarctica and
> > associated land bridges between South America to the west and
> > Indo-Madagascar to the east; and (2) mid- to large-sized, obligate
> > terrestrial forms (e.g. abelisauroid theropod and titanosaurian sauropod
> > dinosaurs and notosuchian crocodyliforms) gained broad distribution
> across
> > Gondwanan land masses prior to fragmentation and were isolated on
> > Indo-Madagascar before the end of the Early Cretaceous.
> > 
> > ====
> > Genise,J. F. and SarzettI, L. C. (2011)
> > Fossil cocoons associated with a dinosaur egg from Patagonia, Argentina.
> > Palaeontology (advance online publication) 
> > doi: 10.1111/j.1475-4983.2011.01064.x
> >
> http://onlinelibrary.wiley.com/doi/10.1111/j.1475-4983.2011.01064.x/abstract
> > 
> > Eight fossil (Cretaceous) insect cocoons were discovered within the
> > infillings of a broken dinosaur egg of a clutch from a Patagonian
> > locality.
> > Cocoons are considered to be in situ based on detailed preservation of
> > thin, delicate walls with surface texture, infillings that are similar
> to
> > the surrounding rock matrix and the clustered distribution of cocoons in
> > only one egg out of the clutch of five eggs. According to the shape,
> size,
> > and thin wall with surface texture, the cocoons are interpreted as
> having
> > been produced by wasps. The wasps may have been attracted to the egg
> > because of the presence of scavenging insects feeding on the decaying
> > organic matter, or they may have been attracted to spiders feeding on
> the
> > scavenging insects. In either scenario, after attacking the insects or
> > spiders inside the sand infillings of the egg, the wasp larvae produced
> > the
> > cocoons described herein. The presence of wasps, which are at the top of
> > the scavenging food webs, suggests that a complex community of
> > invertebrates would have developed around rotten dinosaur eggs.
> > 
> > ==
> > A bit more info on this major new paper (already announced on the DML)
> > with
> > free supps link:
> > http://www.scienzenaturali.org/riviste/memorie/37sup.html
> > 
> > 
> > Cristiano Dal Sasso & Simone Maganuco (2011)
> > Scipionyx samniticus (Theropoda: Compsognathidae) from the Lower
> > Cretaceous
> > of Italy. 
> > Memorie della Società italiana di Scienze naturali e del Museo civico
> di
> > Storia naturale di Milano
> >  37 (2011) 282 pp.
> > 
> > 
> > 
> > 
> > 
> > 
> > --------------------------------------------------------------------
> > mail2web.com - Microsoft® Exchange solutions from a leading provider -
> > http://link.mail2web.com/Business/Exchange
> > 
> > 
> 
> -- 
> NEU: FreePhone - kostenlos mobil telefonieren!                        
> Jetzt informieren: http://www.gmx.net/de/go/freephone

-- 
NEU: FreePhone - kostenlos mobil telefonieren!                  
Jetzt informieren: http://www.gmx.net/de/go/freephone