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Re: Ankylosaurid tail club evolution
The pdf is now free!
On Mon, Aug 31, 2015 at 8:28 AM, Ben Creisler <firstname.lastname@example.org> wrote:
> Ben Creisler
> A new paper:
> Victoria M. Arbour and Philip J. Currie (2015)
> Ankylosaurid dinosaur tail clubs evolved through stepwise acquisition
> of key features.
> Journal of Anatomy (advance online publication)
> DOI: 10.1111/joa.12363
> Ankylosaurid ankylosaurs were quadrupedal, herbivorous dinosaurs with
> abundant dermal ossifications. They are best known for their
> distinctive tail club composed of stiff, interlocking vertebrae (the
> handle) and large, bulbous osteoderms (the knob), which may have been
> used as a weapon. However, tail clubs appear relatively late in the
> evolution of ankylosaurids, and seemed to have been present only in a
> derived clade of ankylosaurids during the last 20 million years of the
> Mesozoic Era. New evidence from mid Cretaceous fossils from China
> suggests that the evolution of the tail club occurred at least 40
> million years earlier, and in a stepwise manner, with early
> ankylosaurids evolving handle-like vertebrae before the distal
> osteoderms enlarged and coossified to form a knob.