[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]

Re: Sungeodon, new dicynodont from Early Triassic of China



Typo in the subject line...sorry.

On Sun, Apr 6, 2014 at 8:50 AM, Ben Creisler <bcreisler@gmail.com> wrote:
> From: Ben Creisler
> bcreisler@gmail.com
>
> A new paper:
>
>
> Michael W. Maisch & Andreas T.Matzke (2014)
> Sungeodon kimkraemerae n. gen. n. sp., the oldest kannemeyeriiform
> (Therapsida, Dicynodontia) and its implications for the early
> diversification of large herbivores after the P/T boundary.
> Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen 272(1): 1-12
> DOI: http://dx.doi.org/10.1127/0077-7749/2014/0394
> http://www.ingentaconnect.com/content/schweiz/njbgeol/2014/00000272/00000001/art00001
>
> The dicynodont Sungeodon kimkraemerae n. gen. n. sp. is described on
> the basis of a skull from the Lower Triassic Jiucaiyuan Formation of
> Dalongkou (Junggar Basin, Xinjiang Uygur Autonomous Region, People's
> Republic of China). It is the first representative of
> Kannemeyeriiformes from the earliest Triassic. Kannemeyeriiforms were
> the predominant clade of Triassic dicynodonts, which constituted a
> major component of terrestrial Triassic ecosystems. The new taxon
> helps closing one of the most significant gaps in the fossil record of
> dicynodonts, since stem-kannemeyeriiforms are known from the Late
> Permian, whereas the first true kannemeyeriiforms previously known are
> late Early Triassic in age. After a phylogenetic analysis Sungeodon
> belongs to the family Stahleckeriidae. Therefore, the Stahleckeriidae
> may not have had its origin in Africa as previously assumed, but in
> Central Asia. More importantly, Sungeodon also suggests that the major
> radiation of kannemeyeriiform dicynodonts, including the emergence of
> all relevant subgroups of this clade, occurred not later than in the
> Early Triassic, soon after the end-Permian extinction. To date, only
> few dicynodont taxa are known from the earliest Triassic, none of
> which are kannemeyeriiforms. The addition of Sungeodon confirms
> previous predictions that our knowledge of Early Triassic dicynodont
> diversity and evolution is far from being complete, and that new
> discoveries from historically low-sampled geographic regions may fill
> this gap. A rapid post-extinction diversification of kannemeyeriiforms
> also fits with the emerging picture from other clades, such as
> archosaurs, of a rapid recovery from the end-Permian event in the
> terrestrial realm.