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Re: Anthracosuchus, new dyrosaurid crocodylomorph from Paleocene of Colombia



From: Ben Creisler
bcreisler@gmail.com

A news release about Anthracosuchus:


http://news.ufl.edu/2014/05/23/ancient-crocodile-species/

On Fri, May 23, 2014 at 8:32 AM, Ben Creisler <bcreisler@gmail.com> wrote:
> From: Ben Creisler
> bcreisler@gmail.com
>
> A new non-dino, non-Mesozoic taxon that may be of interest:
>
> Alexander K. Hasting, Jonathan I. Bloch & Carlos A. Jaramillo (2014)
> A new blunt-snouted dyrosaurid, Anthracosuchus balrogus gen. et sp.
> nov. (Crocodylomorpha, Mesoeucrocodylia), from the Palaeocene of
> Colombia.
> Historical Biology (advance online publication)
> DOI:10.1080/08912963.2014.918968
> http://www.tandfonline.com/doi/full/10.1080/08912963.2014.918968#.U39hn_ldXTo
>
> A new exceptionally brevirostrine dyrosaurid is described from the
> middle Palaeocene (58–60 million years ago) Cerrejón Formation,
> northeastern Colombia, based on four partial skulls and associated
> postcrania. This taxon is unique among dyrosaurids not only in skull
> shape, but also in having orbital tuberosities, and osteoderms that
> are dorsoventrally thick and unpitted, a trait otherwise unknown in
> Crocodylomorpha. Results from a cladistic analysis of Dyrosauridae
> suggest that the new taxon, together with Cretaceous–Palaeocene
> Chenanisuchus lateroculi from Africa and Cerrejonisuchus improcerus
> also from the Cerrejón Formation, are the most basal members of the
> family. Results from a biogeographic analysis indicate at least three
> independent dispersals of dyrosaurids from Africa to the New World
> occurred in the Late Cretaceous or early Palaeocene. Widely set orbits
> in the new taxon indicate a deviation from surface-based predation,
> characteristic of other dyrosaurids, to sub-surface predation, as in
> modern Gavialis. Tooth impressions found on turtle shells recovered
> from the same locality match well with teeth of the new taxon
> indicating possible predation.