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Re: Early Evolution of Rhynchosaurs (free pdf)



Note that a new genus is named:

Langeronyx Ezcurra, Montefeltro & Butler, 2016 for  Rhynchosaurus
brodiei Benton, 1990

pgs.  12-16

On Mon, Jan 11, 2016 at 11:01 AM, Ben Creisler <bcreisler@gmail.com> wrote:
> Ben Creisler
> bcreisler@gmail.com
>
> A new paper in open access:
>
> Martín D. Ezcurra, Felipe Montefeltro  and Richard J. Butler (2016)
> The Early Evolution of Rhynchosaurs.
> Frontiers in Ecology and Evolution 3:142  (23 pgs)
> doi: 10.3389/fevo.2015.00142
> http://dx.doi.org/10.3389/fevo.2015.00142
> http://journal.frontiersin.org/article/10.3389/fevo.2015.00142/full
>
>
>
> The rhynchosaurian archosauromorphs are an important and diverse group
> of fossil tetrapods that first appeared during the Early Triassic and
> probably became extinct during the early Late Triassic (early Norian).
> Here, the early evolution of rhynchosaurs during the Early and early
> Middle Triassic (Induan-Anisian: 252.2-242 Mya) is reviewed based on
> new anatomical observations and their implications for the taxonomy,
> phylogenetic relationships and macroevolutionary history of the group.
> A quantitative phylogenetic analysis recovered a paraphyletic genus
> Rhynchosaurus, with “Rhynchosaurus” brodiei more closely related to
> hyperodapedontines than to Rhynchosaurus articeps. Therefore, a new
> genus is erected, resulting in the new combination Langeronyx brodiei.
> A body size analysis found two independent increases in size in the
> evolutionary history of rhynchosaurs, one among stenaulorhynchines and
> the other in the hyperodapedontine lineage. Maximum likelihood fitting
> of phenotypic evolution models to body size data found ambiguous
> results, with body size evolution potentially interpreted as fitting
> either a non-directional Brownian motion model or a stasis model. A
> Dispersal-Extinction-Cladogenesis analysis reconstructed the areas
> that are now South Africa and Europe as the ancestral areas of
> Rhynchosauria and Rhynchosauridae, respectively. The reconstruction of
> dispersal events between geographic areas that are broadly separated
> paleolatitudinally implies that barriers to the dispersal of
> rhynchosaurs from either side of the paleo-Equator during the Middle
> Triassic were either absent or permeable.