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Re: Guanlong wucaii (was RE: Early Version of T. Rex Is Discovered)

Looks very much like a Jurassic theropod to me (namely _Dilophosaurus_). I
don't know if this crest is single or doubled. In the last case, that would
be a convergence (for what reasons is the question).

----- Original Message -----
From: "Tim Williams" <twilliams_alpha@hotmail.com>
To: <dinosaur@usc.edu>
Sent: Wednesday, February 08, 2006 8:42 PM
Subject: Guanlong wucaii (was RE: Early Version of T. Rex Is Discovered)

> Tom Holtz wrote:
> >Paper, and News & Views, should be out within the next hour or so.
> Yep, indeed it is...
> Xing Xu, James M. Clark, Catherine A. Forster, Mark A. Norell, Gregory M.
> Erickson, David A. Eberth, Chengkai Jia and Qi Zhao. (2006).  A basal
> tyrannosauroid dinosaur from the Late Jurassic of China.  Nature 439:
> 715-718
> Abstract: The tyrannosauroid fossil record is mainly restricted to
> Cretaceous sediments of Laurasia, although some very fragmentary Jurassic
> specimens have been referred to this group.  Here we report a new basal
> tyrannosauroid, _Guanlong wucaii_ gen. et sp. nov., from the lower Upper
> Jurassic of the Junggar Basin, northwestern China.  _G. wucaii_ is the
> oldest known tyrannosauroid and shows several unexpectedly primitive
> features.  Nevertheless, the limbs of _G. wucaii_ share several features
> with derived coelurosaurs, and it possesses features shared by other
> coelurosaurian clades.  This unusual combination of character states
> provides an insight into the poorly known early radiation of the
> Coelurosauria.  Notably, the presumed predatory _Guanlong_ has a large,
> fragile and highly pneumatic cranial crest that is among the most
> known in any non-avian dinosaur and could be comparable to some classical
> exaggerated ornamental traits among vertebrates.
> Theropoda Marsh, 1881
> Coelurosauria von Huene, 1914
> Tyrannosauroidea Osborn, 1905
> _Guanlong wucaii_ gen. et sp. nov.
> Etymology. The generic name is derived from the Chinese Guan (crown) and
> long (dragon); the specific name is from the Chinese wucai (five colours),
> which refers to the rich colours of rocks that produced the specimens.
> Holotype. IVPP (Institute of Vertebrate Paleontology and
> Beijing) V14531 is a partly articulated skeleton preserving most of the
> elements.
> Referred material. IVPP V14532 is much smaller than the holotype and is a
> fully articulated, nearly complete skeleton.
> Locality and horizon. Wucaiwan area, Junggar Basin, Xinjiang; Oxfordian
> upper part of the Shishugou Formation.