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RE: The New Papers Knight

One more for the road...

Da-qing Li, Hai-lu You, & Jian-ping Zhang (2008).  A new specimen of 
_Suzhousaurus megatherioides_ (Dinosauria: Therizinosauroidea) from the Early 
Cretaceous of northwestern China.  Can. J. Earth Sci. 45(7): 769–779.

Abstract: "A new specimen of a therizinosauroid dinosaur recovered from the 
Lower Cretaceous Xinminpu Group in the Yujingzi Basin of the Jiuquan area, 
Gansu Province, northwestern China, consists of a partial postcranial skeleton, 
including a well-preserved left half of the pelvic girdle.  It is referred to 
_Suzhousaurus megatherioides_ Li et al., 2007 based on the autapomorphic 
anterior concavity of its pubic shaft and is the second known specimen of this 
taxon.  Comparisons of the structure of therizinosauroid pelvic girdles show 
that the pelvis of _Suzhousaurus_ possesses several unique features, including 
a laterally deflected, thin, and flat preacetabular process of the ilium, a 
smoothly curved anterodorsal margin of the preacetabular process of the ilium, 
and a concave anterior margin of the pubic shaft.  Cladistic analysis confirms 
that _Suzhousaurus_ is more derived than the Early Cretaceous therizinosauroids 
_Falcarius_ and _Beipiaosaurus_, less derived than Late Cretaceous
 forms, and likely closely related to _Alxasaurus_ from the Early Cretaceous of 
Inner Mongolia, China."

> Sorry I've been lapse on reporting of late (like it's never happened
> before...), but here's a few newbies:
> He, T., Wang, X.-L., and Zhou, Z.-H. 2008. A new genus and species of
> caudipterid dinosaur from the Lower Cretaceous Jiufotang Formation of
> western Liaoning, China. Vertebrata PalAsiatica 46(3):178-189.
> ABSTRACT: Anew oviraptorosaur, Similicaudipteryx yixianensis gen. el sp.
> nov. is described from the Jiufotang Formation (120 Ma) of the Jeho1 Group
> in western Liaoning. China. which is referred to the Caudipteridae based on
> a dagger-like pygostyle and the shape of the ilium that are most similar to
> those of Caudipteryx. It differs from other oviraptorosaurids in that the
> ratio of pubis to ilium length is 1.46 and the presence of two large and
> deep hypapophyses on dorsal vertebrae. The known caudipterids have
> previously been found only from the Jianshangou Member of the Yixian
> Formation (125 Ma) of the Sihetun area in Liaoning Province. S. yixianensis
> represents the first caudipterid dinosaur from the Jiufotang Formation. The
> new discovery provides more information for the discussion of the evolution
> of oviraptorids during the Early Cretaceous and adds to the dinosaur
> assemblage of the Jehol Biota.
> Martinelli, A.G., and Pais, D.F. 2008. A new baurusuchid crocodyliform
> (Archosauria) from the Late Cretaceous of Patagonia (Argentina). Comptes
> Rendus Palevol 7(6):371-381. doi: 10.1016/j.crpv.2008.05.002.
> ABSTRACT: A new baurusuchid, Wargosuchus australis gen. et sp. nov., coming
> from the Bajo de La Carpa Formation, Neuquén Province (Argentina), is
> described. This new taxon is based on a fragment of snout and a portion of
> the cranial roof. Wargosuchus differs from other crocodyliforms by
> possessing a deep median groove on the frontals, a contact between nasals
> and frontals extremely reduced, a large depression for the olfactory bulbs,
> three large foramina surrounding the large, smooth perinarial depression,
> and a hypertrophied, conical last premaxillary tooth followed by a large
> paracanine fossa. The finding of Wargosuchus in Patagonia (Argentina), a
> taxon with a strong resemblance to Brazilian baurusuchids, reinforces the
> hypothesis of a similar biota between both regions by the Late Cretaceous.
> Wargosuchus and Cynodontosuchus represent the only Argentinian
> mesoeucrocodylians to be included within Baurusuchidae. This finding extends
> the number of crocodyliforms from the Bajo de la Carpa Formation, which, in
> turn, corresponds to the most taxonomically diverse one in Argentina.
> Bell, P.R., and Snively, E. 2008. Polar dinosaurs on parade: a review of
> dinosaur migration. Alcheringa 32(3):271-284. doi:
> 10.1080/03115510802096101.
> ABSTRACT: Cretaceous polar dinosaur faunas were taxonomically diverse, which
> suggests varied strategies for coping with the climatic stress of high
> latitudes. Some polar dinosaurs, particularly larger taxa such as the
> duckbill Edmontosaurus Lambe, 1917, were biomechanically and energetically
> capable of migrating over long distances, up to 2600 km. However, current
> evidence strongly suggests many polar dinosaurs (including sauropods, large
> and small theropods, and ankylosaurs of New Zealand) overwintered in
> preference to migration. Certain groups also appear more predisposed to
> overwintering based on their physical inability (related to biomechanics,
> natural history, or absolute size) to migrate, such as ankylosaurs and many
> small taxa, including hypsilophodontids and troodontids. Low-nutrient
> subsistence is found to be the best overwintering method overall, although
> the likelihood that other taxa employed alternative means remains plausible.
> Despite wide distribution of some genera, species-level identification is
> required to assess the applicability of such distributions to migration
> distances. Presently, such resolution is not available or contradicts the
> migration hypothesis.
> Fricke, H.C., Rogers, R.R., Backlund, R., Dwyer, C.N., and Echt, S. 2008.
> Preservation of primary stable isotope signals in dinosaur remains, and
> environmental gradients of the Late Cretaceous of Montana and Alberta.
> Palaeogeography, Palaeoclimatology, Palaeoecology 266(1-2):13-27. doi:
> 10.1016/j.palaeo.2008.03.030.
> ABSTRACT: Although the use of stable isotope data from vertebrate remains is
> becoming common for the Cenozoic, their application to Mesozoic environments
> has been rare, in part due to the perception that diagenesis has obfuscated
> all potential primary signal. In this paper, we illustrate how stable
> isotope data collected from dinosaur and other vertebrate remains can in
> fact be used to reconstruct paleoenvironmental conditions during the
> Mesozoic.
> Carbon and oxygen isotope ratios were measured from tooth enamel of
> hadrosaur dinosaurs and from scales of freshwater fish that were collected
> from sites in the Two Medicine, Judith River, and Dinosaur Park Formations
> of Montana and Alberta. These formations represent a coastal to upland
> gradient along the western margin of the Late Cretaceous inland seaway.
> Isotopic comparisons among skeletal components and among taxa are used as
> evidence that primary paleoenvironmental information, as recorded by isotope
> data, is preserved in tooth enamel and freshwater fish scales. A comparison
> of carbon isotope ratios between hadrosaur tooth enamel and sedimentary
> organic matter indicates that these animals had a larger isotopic offset
> compared to bulk diet than modern mammals, and that all hadrosaurian isotope
> data are consistent with the existence of C3-only ecosystems.
> Higher and more variable carbon and oxygen isotope ratios from animals
> occupying the coastal Judith River region are interpreted to reflect a range
> of freshwater to brackish water conditions and plants that were undergoing
> water stress. Lower and less variable carbon and oxygen isotope ratios from
> the upland Two Medicine and intermediate Dinosaur Park areas are interpreted
> to reflect a gradual rainout of moisture from air masses moving inland and
> more uniform environmental conditions. Overall, these results indicate that
> stable isotopes from dinosaur and other vertebrate remains have the
> potential to expand our understanding of terrestrial environments and
> ecosystems during the Mesozoic.
> Turner-Walker, G., and Jans, M. 2008. Reconstructing taphonomic histories
> using histological analysis. Palaeogeography, Palaeoclimatology,
> Palaeoecology 266(3-4):227-235. doi: 10.1016/j.palaeo.2008.03.024.
> ABSTRACT: Recent years have seen rapid advances in the understanding of
> diagenetic changes to bone tissues and how these influence the chemistry,
> microstructure and histological appearance of ancient bone. It is now
> possible to recognise many characteristic features of diagenetically
> modified bone and this has led to the potential use of these parameters in
> estimating the potential survival of biogenic signals such as DNA, lipids,
> proteins and stable isotopes. These characteristic features also hold the
> potential for preserving a record of different post-mortem environments in
> individual bones or assemblages of bones from the same site. In sites where
> the burial conditions have changed over archaeological or geological
> timescales, histological analyses can shed light on these different burial
> environments and permit the reconstruction of taphonomic histories of some
> bones. Examination of polished sections of bone using BSE-SEM has been used
> to identify characteristic features attributed to aerobic soil bacteria,
> cyanobacteria, and sulphate reducing bacteria. The approach shows promise
> for providing supplementary evidence when phasing complex sites, such as
> graveyards, which developed over several hundred years.
> Pevzner, P.A., Kim, S., and Ng, J. 2008. Comment on "Protein sequences from
> mastodon and Tyrannosaurus rex revealed by mass spectroscopy". Science
> 321:1040. doi: 10.1126/science.1155006.
> ABSTRACT: Asara et al. (Reports, 13 April 2007, p. 280) reported sequencing
> of Tyrannosaurus rex proteins and used them to establish the evolutionary
> relationships between birds and dinosaurs. We argue that the reported T. rex
> peptides may represent statistical artifacts and call for complete data
> release to enable experimental and computational verification of their
> findings.
> Asara, J.M., Schweitzer, M.H., Cantley, L.C., and Cottrell, J.S. 2008.
> Response to comment on "Protein sequences from mastodon and Tyrannosaurus
> rex revealed by mass spectroscopy". Science 321:1040. doi:
> 10.1126/science.1157829.
> ABSTRACT: Endogenous peptide sequences extracted from a 68-million-year-old
> Tyrannosaurus rex fossil bone and obtained by mass spectrometry have been
> shown to be statistically significant based on protein database searches
> using two different search engines and similarity comparisons to authentic
> tandem mass spectrometry spectra. Specifically, we have validated the
> sequence GVVGLP(OH)GQR.
> Rybczynski, N., Tirabasso, A., Cuthbertson, R., and Holliday, C. 2008. A
> three-dimensional animation model of Edmontosaurus (Hadrosauridae) for
> testing chewing hypotheses. Palaeontologica Electronica 11(2):9A (1-14).
> ABSTRACT: Here we describe a 3-D animated model of the craniodental system
> of a hadrosaur, developed for testing hypotheses of feeding kinematics. The
> model was created from scanned cranial elements of an Edmontosaurus regalis
> paratype (CMN 2289). Movements within the model were created in animation
> software using inverse kinematics and a wiring system composed of cranial
> elements. The model was used to reproduce the pleurokinetic hypothesis of
> hadrosaur chewing. The pleurokinetic hypothesis, formally developed in the
> 1980s, proposed that hadrosaurs employed transverse chewing movements via
> cranial kinesis. Specifically during the powerstroke the maxillae were
> abducted. This is the first model to allow investigation into secondary
> intracranial movements that must have occurred in order for the skull to
> accommodate the primary, pleurokinetic movements. This study found secondary
> movements to be extensive among the joints of the palate and face. Further
> refinement and development of the model, including the integration of
> soft-tissue structures, will allow for a more in-depth examination of the
> pleurokinetic hypothesis and comparison with alternative feeding hypotheses.
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> Jerry D. Harris
> Director of Paleontology
> Dixie State College
> Science Building
> 225 South 700 East
> St. George, UT 84770 USA
> Phone: (435) 652-7758
> Fax: (435) 656-4022
> E-mail: jharris@dixie.edu
> and dinogami@gmail.com
> http://cactus.dixie.edu/jharris/
> "Football is like chess, only without
> the dice."
> --- German soccer player Lukas
> Podolski
> "I don't fail. I find new ways to not
> succeed."
> --- Christopher Titus

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