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RE: Jixiangornis a junior synonym of Jeholornis



Yes, Dyke just emailed me unaware that the paper was online yet.  Brontomerus 
or Coronosaurus anyone?

Mickey Mortimer

----------------------------------------
> Date: Fri, 16 Nov 2012 14:08:59 +0100
> From: Michael.Lange@gmx.ch
> To: dinosaur@usc.edu
> Subject: RE: Jixiangornis a junior synonym of Jeholornis
>
> Funny, the link doesn't work anymore. The accepted MS has apparently been 
> taken off.
>
> -------- Original-Nachricht --------
> > Datum: Fri, 16 Nov 2012 03:52:01 -0800
> > Von: Mickey Mortimer <mickey_mortimer111@msn.com>
> > An: "dinosaur@usc.edu" <dinosaur@usc.edu>
> > Betreff: RE: Jixiangornis a junior synonym of Jeholornis
>
> >
> > Ack, this paper is highly flawed.  See here for the details-
> > http://theropoddatabase.blogspot.com/012//1//wang-et-al-012--for-once-im-against.html
> >  ,
> > but the short story is-
> >
> > This paper is flawed for so many reasons.  It presents incorrect data
> > often.  Several times it contradicts itself, and has frequent grammatical 
> > and
> > spelling errors.  The new specimen isn't even described, with only one
> > photo and a schematic illustration.  Very odd features of the specimen
> > aren't even noted- ~16 caudals; completely concave medial coracoid margin
> > distally; only two non-ungual phalanges on manual digit III;
> > subarctometatarsalian pes (the furcular morphology would be way too weird 
> > to pass by as well if
> > it were real).  That whole furcular misidentification issue [see blog].
> > Many times facts are brought up that have no bearing on the synonymy
> > issue, as when the new specimen resembles both taxa.  The main argument of 
> > the
> > paper is because this specimen shows exclusive features of each taxon,
> > those taxa are synonymous, yet these differences are often ~1% ratios and 
> > most
> > proposed differences aren't even mentioned (dentary teeth; caudal count;
> > fused sternum; stratigraphic level; just to take some mentioned by Ji et 
> > al.,
> > 2002).  There's no attempt to examine the literature for differences
> > between each taxon, let alone the specimens.  The measurement table lacks 
> > both
> > IVPP V13550 and palmapenis, not to mention the CAGS Jixiangornis specimen
> > Turner (2008) and Nesbitt et al. (2009) used, and lacks one of the basic
> > measurements mentioned in the text.  Perhaps most sad is they didn't even
> > seem to read the original description of the taxon they're sinking, not
> > citing its diagnosis and citing a matrix coding by someone else instead of a
> > measurement explicitly listed in the description's Table 1.
> >
> > Are Shenzhouraptor and Jixiangornis synonyms?  This would require
> > evaluation of over 50 supposed differences mentioned in the literature I 
> > noted in
> > my post, but not by Wang et al..  In the meantime, I think YFGP-yb2 is
> > certainly not Shenzhouraptor, and probably not Jixiangornis (may be a small
> > adult?).
> >
> > Mickey Mortimer
> >
> > ----------------------------------------
> > > Date: Wed, 4 Nov 012 8::7::3 -800<
> > > From: bcreisler@gmail.com
> > > To: dinosaur@usc.edu
> > > Subject: Jixiangornis a junior synonym of Jeholornis
> > >
> > > From: Ben Creisler
> > > bcreisler@gmail.com
> > >
> > >
> > > A new online advance paper:
> > >
> > > Xia Wang, Gareth Dyke, and Pascal Godefroit (012))
> > > A new specimen of a Jeholornis-like long-tailed bird shows that
> > > Jixiangornis is a junior synonym of Jeholornis prima.
> > > Acta Palaeontologica Polonica (in press)
> > > doi: http://dx.doi.org/0..202//app.012..051<
> > > http://app.pan.pl/article/item/app0120051..html
> > >
> > >
> > > We describe a new specimen of a long-tailed bird from the Lower
> > > Cretaceous Yixian Formation of China. Because this new specimen
> > > exhibits characters seen in specimens referred to Jeholornis (e.g.
> > > subequal manus:humerus lengths, radius:ulna shaft widths and the
> > > absence of an intermetacarpal tubercle on metatarsal II) as well as
> > > some seen in specimens referred to Jixiangornis (e.g. enlarged ungual,
> > > strut-like coracoid) we argue that it demonstrates, most
> > > parsimoniously, that these two named taxa are synonymous.
> >