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Re: Ah ha! That's where therizinosaurs came from

Jaime Headden <qi_leong@hotmail.com> wrote:

>   I have a hard time seeing sapeornithids (any of them) as oviraptorsaurs. 
> The skulls (e.g., Zhou & Zhang, 2003) are superifically similar (and by 
> superficially, I mean cherry-picking specific oviraptorosaurs and ignoring 
> others, like for example *Incisivosaurus gauthieri*) but seem to differ in 
> the details, or are represented broadly among maniraptorans, like 
> *Scansoriopteryx heilmanni* (Czerkas & Yuan, 2002) and *Epidexipteryx hui* 
> (Zhang et al. 2008).

Andrea Cau has proposed a clade (named "Magnoviraptorosauria")
containing not only oviraptorosaurs and sapeornithids, but
scansoriopterygids as well. Given that Xu et al. (2010) supported a
sister group relationship between scansoriopterygids and
oviraptorosaurs to the exclusion of sapeornithids and Paul (2010)
argued for a link between oviraptorosaurs and sapeornithids (with
scansoriopterygids as _Coelurosauria_ incertae sedis), it may be or
become the best explanation for the problem. The distribution of skull
characters you mention seems to support it.




Paul GS 2010 The Princeton Field Guide to Dinosaurs. Princeton:
Princeton Univ Press. 320 p

Xu X, Ma Q-Y, Hu D-Y 2010 Pre-_Archaeopteryx_ coelurosaurian dinosaurs
and their implications for understanding avian origins. Chin Sci Bull
55: 1-7
David Černý