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Re: Australian spinosaur ref and other new papers
It should be noticed that the spinosaur paper is for free. Pdf is available
-------- Original-Nachricht --------
> Datum: Tue, 21 Jun 2011 12:55:49 -0400
> Von: "firstname.lastname@example.org" <email@example.com>
> An: firstname.lastname@example.org
> Betreff: Australian spinosaur ref and other new papers
> From: Ben Creisler
> 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
> 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,
> 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.
> 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
> 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
> Ornithurine bird radiation.
> Paläontologische Zeitschrift (advance online publication)
> DOI: 10.1007/s12542-011-0112-2
> We report the discovery of an isolated avian carpometacarpus from the
> Cretaceous Allen Formation (Campanian-Maastrichtian), Salitral Moreno,
> 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
> 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
> 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
> Aim To evaluate the Gunnerus Ridge land-bridge hypothesis, which
> 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
> 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,
> 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
> 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
> Eight fossil (Cretaceous) insect cocoons were discovered within the
> infillings of a broken dinosaur egg of a clutch from a Patagonian
> 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
> 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)
> free supps link:
> Cristiano Dal Sasso & Simone Maganuco (2011)
> Scipionyx samniticus (Theropoda: Compsognathidae) from the Lower
> of Italy.
> Memorie della Società italiana di Scienze naturali e del Museo civico di
> Storia naturale di Milano
> 37 (2011) 282 pp.
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