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

Re: Spinosaurus redescribed as giant semiaquatic theropod

Ben Creisler

Blogs and news...

Spinosaurus exhibit inside look





Nizar Ibrahim


On Thu, Sep 11, 2014 at 11:32 AM, Ben Creisler <bcreisler@gmail.com> wrote:
> News stories
> http://press.nationalgeographic.com/2014/09/11/scientists-report-first-semiaquatic-dinosaur-spinosaurus/
> with videos
> http://news.nationalgeographic.com/news/2014/09/140911-spinosaurus-fossil-discovery-dinosaur-science/
> ***
> with video
> http://phys.org/news/2014-09-shark-munching-spinosaurus-first-known-dinosaur.html
> ***
> (including some skepticism by other paleontologists about conclusions...)
> http://www.nature.com/news/swimming-dinosaur-found-in-morocco-1.15901
> http://www.newscientist.com/article/dn26193-biggest-hunting-dinosaur-was-an-aquatic-sharkgobbler.html
> On Thu, Sep 11, 2014 at 11:14 AM, Ben Creisler <bcreisler@gmail.com> wrote:
>> Ben Creisler
>> bcreisler@gmail.com
>> It's out...
>> Nizar Ibrahim, Paul C. Sereno, Cristiano Dal Sasso, Simone Maganuco,
>> Matteo Fabbri, David M. Martill, Samir Zouhri, Nathan Myhrvold, and
>> Dawid A. Iurino (2014)
>> Semiaquatic adaptations in a giant predatory dinosaur.
>> Science (advance online publication)
>> DOI: 10.1126/science.1258750
>> http://www.sciencemag.org/content/early/2014/09/10/science.1258750.abstract
>> NOTE: Supplementary material is free.
>> We describe adaptations for a semiaquatic lifestyle in the dinosaur
>> Spinosaurus aegyptiacus. These adaptations include retraction of the
>> fleshy nostrils to a position near the mid-region of the skull and an
>> elongate neck and trunk that shift the center of body mass anterior to
>> the knee joint. Unlike terrestrial theropods, the pelvic girdle is
>> downsized, the hind limbs are short, and all of the limb bones are
>> solid without an open medullary cavity, for buoyancy control in water.
>> The short, robust femur with hypertrophied flexor attachment and the
>> low, flat-bottomed pedal claws are consistent with aquatic
>> foot-propelled locomotion. Surface striations and bone microstructure
>> suggest that the dorsal “sail” may have been enveloped in skin that
>> functioned primarily for display on land and in water.
>> ==
>> Michael Balter (2014)
>> Giant dinosaur was a terror of Cretaceous waterways.
>> Science  345(6202): 1232
>> DOI: 10.1126/science.345.6202.1232
>> http://www.sciencemag.org/content/345/6202/1232.summary
>> Researchers have long debated whether dinosaurs could swim, but there
>> has been little direct evidence for aquadinos. Some tantalizing hints
>> have appeared, however, in claimed "swim tracks" made by the bellies
>> of dinos in Utah and oxygen isotopes indicating possible aquatic
>> habitats in a group of dinosaurs called spinosaurs. Now, a research
>> team working in Morocco has found the most complete skeleton yet of a
>> giant carnivore called Spinosaurus, very fragmentary remains of which
>> were first discovered in 1912 in Egypt. The new fossils not only
>> confirm that Spinosaurus was bigger than Tyrannosaurus rex, but also
>> show that it had evolutionary adaptations—ranging from pedal-like feet
>> to a nostril far back on the head to high bone density like that of
>> hippos—clearly suited for swimming in lakes and rivers.