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Re: Therocephalians from Lower Triassic of Antarctica.



From: Ben Creisler
bcreisler@gmail.com


The paper is now posted on the AMNH site for free downloading. The
orientation looks correct but the photos are still not very clear. I
presume things will improve when the specimens have been fully
prepared.

http://digitallibrary.amnh.org/dspace/handle/2246/6163

http://digitallibrary.amnh.org/dspace/bitstream/handle/2246/6163/N3738.pdf?sequence=1

==============

>Huh... seems like there was a problem with pictures (hardly readable) and 
>paper orientation (landscape instead of portrait ?) !

Hope it will be corrected by the American Museum Novitates staff !

Jocelyn

Le 05/03/2012 18:29, Ben Creisler a écrit :

> From: Ben Creisler
> bcreisler@gmail.com
>
> Some DML apparently members don't like non-dino postings, but I think
> new papers that provide insights into the climate, ecosystems, and
> amniote fauna of the Mesozoic may interest some. Here's a new
> paper--the pdf will be available for free in a day or so:
>
> Adam K. Huttenlocker and Christian A. Sidor (2012)
> Taxonomic Revision of Therocephalians (Therapsida: Theriodontia) from
> the Lower Triassic of Antarctica.
> American Museum Novitates Number 3738 :1-19. 2012
> http://www.bioone.org/doi/abs/10.1206/3738.2
>
> Not yet posted for free download on the AMNH site. Check here:
> http://digitallibrary.amnh.org/dspace/handle/2246/9
>
> ABSTRACT
> We reevaluate the taxonomic status of therocephalian fossils recovered
> from the lower Fremouw Formation (Lower Triassic) of the central
> Transantarctic Mountains, Antarctica. The material, which includes
> mostly fragmentary juvenile specimens, is reidentified using an
> apomorphy-based approach. We recognize the presence of three
> higher-level taxa: Eutherocephalia, Akidnognathidae, and Baurioidea.
> The only genus-level identification is for a partial lower jaw and
> pterygoid tentatively attributed to the baurioid, Ericiolacerta parva.
> An indeterminate theriodont partial skull is reassigned to the
> therocephalian family Akidnognathidae. The holotypes of Pedaeosaurus
> parvus and Rhigosaurus glacialis are represented by indeterminate
> juvenile baurioids and, in the absence of clear autapomorphies, are
> considered nomina dubia. The results of the taxonomic revision
> indicate that the therocephalian fauna of Antarctica lacks endemic
> genera and thus corresponds to that of the Triassic Lystrosaurus
> Assemblage Zone fauna of South Africa's Karoo Basin. More generally,
> we consider the southern Gondwanan basins of South Africa and
> Antarctica to sample a broadly distributed Lower Triassic tetrapod
> fauna, although the latter basin documents the first occurrence of
> several taxa (e.g., Kombuisia, Palacrodon). More precise (i.e.,
> species-level) identifications are needed to better constrain the
> biogeographic signal for therocephalians, but the presence of
> juveniles strongly suggests that this group of therapsids, like
> dicynodonts, were year-round high-latitude inhabitants during Early
> Triassic times.
>