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Re: Arenysaurus (hadrosaur from Spain) neuroanatomy



Ben Creisler
bcreisler@gmail.com

The paper is now out in final form:

Cruzado-Caballero P, Fortuny J, Llacer S, Canudo J. (2015)
Paleoneuroanatomy of the European lambeosaurine dinosaur Arenysaurus ardevoli.
PeerJ 3:e802
doi: http://dx.doi.org/10.7717/peerj.802
https://peerj.com/articles/802/

On Thu, Nov 6, 2014 at 10:17 AM, Ben Creisler <bcreisler@gmail.com> wrote:
> Ben Creisler
> bcreisler@gmail.com
>
> An online preprint version of a new paper in open access:
>
>
>
> Penélope Cruzado-Caballero, Josep Fortuny, Sergio Llacer & José
> Ignacio JI Canudo (2014)
> Arenysaurus ardevoli, first paleoneuroanatomical description of a
> European hadrosaurid.
> PeerJ PrePrints 2:e590v1
> doi:  http://dx.doi.org/10.7287/peerj.preprints.590v1
> https://peerj.com/preprints/590/
>
>
>
> The neuroanatomy of hadrosaurid dinosaurs is well known from North
> America and Asia. In Europe only a few cranial remains have been
> recovered with the braincase. Arenysaurus is the first European
> endocast for which the paleoneuroanatomy has been studied. The
> resulting data have enabled us to draw ontogenetic, phylogenetic and
> functional inferences. Arenysaurus preserves the endocast and the
> inner ear. This cranial material was CT-scanned, and a 3D-model was
> generated. The endocast morphology supports a general pattern for
> hadrosaurids with some characters that distinguish to a subfamily
> level, such as a brain cavity anteroposteriorly shorter or the angle
> of the major axis of the cerebral hemisphere to the horizontal in
> lambeosaurines. Both characters are present in the endocast of
> Arenysaurus. Moreover, osteological features indicate an adult
> ontogenetic stage while some paleoneuroanatomical features are
> indicative of a subadult ontogenetic stage and even a juvenile
> ontogenetic stage. Finally, a comparison with other hadrosaurids
> reveals that the low values for the angle of the dural peak may be an
> autapomorphy exclusive to the Parasaurolophus genus. It is
> hypothesized that the presence of puzzling characters that suggest
> different ontogenetic stages for this specimen, may reflect some
> degree of dwarfism in Arenysaurus. Regarding the inner ear, its
> structure shows differences from the ornithopod clade with respect to
> the height of the semicircular canals. These differences could lead to
> a decrease in the compensatory movements of eyes and head, with
> important implications for the paleobiology and behavior of
> hadrosaurid taxa such as Edmontosaurus, Parasaurolophus and
> Arenysaurus. These differences in the vestibular system could be used
> as a phylogenetical signal. The endocranial morphology of European
> hadrosaurids sheds new light on the evolution of this group and may
> reflect the conditions in the archipelago where these animals lived
> during the Late Cretaceous.