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Re: Cartorhynchus, new primitive (basal) ichthyosauriform from Lower Triassic of China



Ben Creisler
bcreisler@gmail.com

Radio interview with Ryosuke Motani about Cartorhynchus:



http://www.capradio.org/news/insight/2014/11/10/insight-111014b/


On Wed, Nov 5, 2014 at 10:26 AM, Ben Creisler <bcreisler@gmail.com> wrote:
> Ben Creisler
> bcreisler@gmail.com
>
> A new online paper in Nature:
>
> Ryosuke Motani, Da-Yong Jiang, Guan-Bao Chen, Andrea Tintori, Olivier
> Rieppel, Cheng Ji & Jian-Dong Huang (2014)
> A basal ichthyosauriform with a short snout from the Lower Triassic of China.
> Nature (advance online publication)
> doi:10.1038/nature13866
> http://www.nature.com/nature/journal/vaop/ncurrent/full/nature13866.html
>
> The incompleteness of the fossil record obscures the origin of many of
> the more derived clades of vertebrates. One such group is the
> Ichthyopterygia, a clade of obligatory marine reptiles that appeared
> in the Early Triassic epoch, without any known intermediates. Here we
> describe a basal ichthyosauriform from the upper Lower Triassic (about
> 248 million years ago) of China, whose primitive skeleton indicates
> possible amphibious habits. It is smaller than ichthyopterygians and
> had unusually large flippers that probably allowed limited terrestrial
> locomotion. It also retained characteristics of terrestrial diapsid
> reptiles, including a short snout and body trunk. Unlike more-derived
> ichthyosauriforms, it was probably a suction feeder. The new species
> supports the sister-group relationships between ichthyosauriforms and
> Hupehsuchia, the two forming the Ichthyosauromorpha. Basal
> ichthyosauromorphs are known exclusively from south China, suggesting
> that the clade originated in the region, which formed a warm and humid
> tropical archipelago in the Early Triassic. The oldest unequivocal
> record of a sauropterygian is also from the same stratigraphic unit of
> the region.
>
> News stories:
>
>
> http://news.nationalgeographic.com/news/2014/11/141105-ichthyosaurs-sea-monsters-dinosaurs-science-fossils/
>
> https://www.sciencenews.org/article/ancient-sea-creature-took-land-and-sea
>
> http://www.theguardian.com/science/2014/nov/05/ichtyhyosaur-fossil-found-marine-reptile