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Riodevemys, new Late Jurassic turtle from Europe



From: Ben Creisler
bcreisler@gmail.com

A recent non-dino paper that might be of interest:

Adán Pérez-García, Rafael Royo-Torres & Alberto Cobos (2014)
A new European Late Jurassic pleurosternid (Testudines,
Paracryptodira) and a new hypothesis of paracryptodiran phylogeny.
Journal of Systematic Palaeontology (advance online publication)
DOI:10.1080/14772019.2014.911212
http://www.tandfonline.com/doi/full/10.1080/14772019.2014.911212#.U4SoMPldXTo



Paracryptodira was an abundant and diverse group of freshwater
turtles, recognized both in North America and Europe. Its known record
spans the Middle Jurassic to the Eocene. The internal phylogenetic
relationships of one of its clades, Baenidae, are relatively well
known. However, information on the relationships amongst the
non-baenid members is very limited and, so far, poorly justified. A
new study on the phylogenetic relationships amongst Paracryptodira is
undertaken here through the revision of previously described taxa, the
incorporation of information on taxa recently discovered or revised,
and the study of new material. In addition, a new taxon from the Late
Jurassic of Europe is described: Riodevemys inumbragigas gen. et sp.
nov. It is identified as a member of Pleurosternidae, constituting the
first generic and specific attribution of a pleurosternid in the
Spanish fossil record. Pleurosternidae is obtained here as a robust
node whose composition differs from previous proposals. The
relationships amongst representatives are analysed. In addition, we
define a new clade, Compsemydidae, identified as the sister group of
Baenoidea (Baenidae + Pleurosternidae). The new phylogenetic proposal,
and its analysis in view of stratigraphical distributions, shows that
Baenidae was a clade of turtles only known in the Cretaceous and
Palaeogene of the North American record but that Pleurosternidae and
Compsemydidae were distributed both in North America and Europe. The
temporal distribution of Pleurosternidae is restricted here, refuting
some putatively older and younger occurrences. This new hypothesis
restricts its known distribution to the Late Jurassic of North America
and the Late Jurassic and the first part of the Early Cretaceous of
Europe. The new clade Compsemydidae is recognized in the Late
Cretaceous and Palaeocene of North America and in younger levels of
the European Palaeocene.