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

Re: Fwd: Procolophonid from Spain and other non-dino papers

For what it's worth I received it from the DML on the first attempt.


From: Ben Creisler <bcreisler@gmail.com>

To: dinosaur@usc.edu 
>Sent: Wednesday, May 21, 2014 2:22 PM
>Subject: Fwd: Procolophonid from Spain and other non-dino papers
>This posting apparently did not reach the DML the first time I tried
>to send it (an on-going cyber problem).
>---------- Forwarded message ----------
>From: Ben Creisler <bcreisler@gmail.com>
>Date: Wed, May 21, 2014 at 10:51 AM
>Subject: Procolophonid from Spain and other non-dino papers
>To: dinosaur@usc.edu
>From: Ben Creisler
>A number of recent non-dino papers that may be of interest to some:
>J. Fortuny, A. Bolet, A. G. Sellés &  A. Galobart (2014)
>A potential record of a procolophonid parareptile from the Triassic of
>the Iberian Peninsula.
>Geologica Acta 12(2), June 2014  (advance online publication)
>Cranial and postcranial remains from the Middle Triassic of the
>North-Eastern part of the Iberian Peninsula are reported and
>tentatively assigned to Procolophonidae. The finding is the first
>occurrence of a procolophonid parareptile in the Iberian Peninsula,
>representing the southernmost record of the group in Europe. The
>fossilbearing locality is dated as Anisian (Middle Triassic) and
>includes three tooth-bearing bones, two cranial bone fragments and one
>interclavicle. The mandible described herein includes nine teeth. No
>cusps or complete crowns are preserved, but sections of the teeth are
>available. The three anterior teeth progressively decrease in size
>from front to back, while the teeth from the fourth to the eighth
>position present the opposite trend. The last tooth (the ninth) is
>clearly reduced in comparison to the previous ones. A close
>relationship with Anomoiodon-Kapes is suggested, however, more
>material is required in order to assess the exact taxonomical
>determination of the Iberian remains. This finding is expected to shed
>some light on t
al distribution of procolophonines.
>A. Watanabe and D. E. Slice (2014)
>The utility of cranial ontogeny for phylogenetic inference: a case
>study in crocodylians using geometric morphometrics.
>Journal of Evolutionary Biology (advance online publication)
>DOI: 10.1111/jeb.12382
>The degree to which the ontogeny of organisms could facilitate our
>understanding of phylogenetic relationships has long been a subject of
>contention in evolutionary biology. The famed notion that ‘ontogeny
>recapitulates phylogeny’ has been largely discredited, but there
>remains an expectation that closely related organisms undergo similar
>morphological transformations throughout ontogeny. To test this
>assumption, we used three-dimensional geometric morphometric methods
>to characterize the cranial morphology of 10 extant crocodylian
>species and construct allometric trajectories that model the
>post-natal ontogenetic shape changes. Using time-calibrated molecular
>and morphological trees, we employed a suite of comparative
>phylogenetic methods to assess the extent of phylogenetic signal in
>these trajectories. All analyses largely demonstrated a lack of
>significant phylogenetic signal, indicating that ontogenetic shape
>changes contain little phylogenetic information. Notably, some Mantel
>tests yielded marginally significant results when analysed with the
>morphological tree, which suggest that the underlying signal in these
>trajectories is correlated with similarities in the adult cranial
>morphology. However, despite these instances, all other analyses,
>including more powerful tests for phylogenetic signal, recovered
>statistical and visual evidence against the assumption that
>similarities in ontogenetic shape changes are commensurate with
>phylogenetic relatedness and thus bring into question the efficacy of
>using allometric trajectories for phylogenetic inference.
>Jörn-Frederik Wotzlaw, Jean Guex, Annachiara Bartolini, Yves Gallet,
hristopher A. McRoberts, David Taylor, Blair Schoene
>and Urs Schaltegger (2014)
>Towards accurate numerical calibration of the Late Triassic:
>High-precision U-Pb geochronology constraints on the duration of the
>Geology (advance online publication)
>doi: 10.1130/G35612.1
>Numerical calibration of the Late Triassic stages is arguably the most
>controversial issue in Mesozoic stratigraphy, despite its importance
>for assessing mechanisms of environmental perturbations and associated
>biologic consequences preceding the end-Triassic mass extinction. Here
>we report new chemical abrasion–isotope dilution–thermal ionization
>mass spectrometry zircon U-Pb dates for volcanic ash beds within the
>Aramachay Formation of the Pucara Group in northern Peru that place
>precise constraints on the age of the Norian-Rhaetian boundary (NRB)
>and the duration of the Rhaetian. The sampled ash bed–bearing interval
>is located just above the last occurrence of the bivalve Monotis
>subcircularis, placing this stratigraphic sequence in the uppermost
>Norian, perhaps ranging into the earliest Rhaetian. Zircon U-Pb dates
>of ash beds constrain the deposition age of this interval to be
>between 205.70 ± 0.15 Ma and 205.30 ± 0.14 Ma, providing precise
>constraints on the age of the NRB. Combined with previously published
>zircon U-Pb dates for ash beds bracketing the Triassic-Jurassic
>boundary, we estimate a duration of 4.14 ± 0.39 m.y. for the Rhaetian.
>This ends a prolonged controversy about the duration of this stage and
>has fundamental implications for the rates of paleoenvironmental
>deterioration that culminated in the end-Triassic mass extinction.
>Dieter Uhl, Christoph Hartkopf-Fröder, Ralf Littke & Evelyn Kustatscher (2014)
>Wildfires in the late Palaeozoic and Mesozoic of the Southern Alps—the
>Anisian and Ladinian (Mid Triassic) of the Dolomites (Northern Italy).
>Palaeobiodiversity and Palaeoenvironments (advance on
>Based on anatomical studies of fossil charcoal fragments the first
>evidence for palaeo-wildfires is presented for the Anisian and
>Ladinian of the Dolomites (Northern Italy). These charcoals are from
>the localities Kühwiesenkopf/Monte Prà della Vacca (middle-upper
>Pelsonian, upper Anisian) and Ritberg/Ju Rit (Longobardian, upper
>Ladinian), and they help to fill a gap in our current scientific
>knowledge on the fossil record of Triassic wildfires worldwide.
>Charcoal reflectance values from Kühwiesenkopf are surprisingly high,
>indicating a palaeo-wildfire temperature of approximately 650 °C.