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RE: Precocial nestling



The nice thing about this is that it gives pretty good corroboration for
eggs being preserved in these deposits. And for embryos being preserved
within the eggs (not simply adults caught in the midst of feeding on egg
contents).

Andy

> -----Original Message-----
> From: owner-dinosaur@usc.edu [mailto:owner-dinosaur@usc.edu] On Behalf Of
> David Marjanovic
> Sent: Thursday, October 21, 2004 7:25 PM
> To: DML
> Subject: Re: Precocial nestling
> 
> ----- Original Message -----
> From: "Christopher Taylor" <ck.taylor@auckland.ac.nz>
> Sent: Thursday, October 21, 2004 11:07 PM
> 
> > In today's Science:
> http://www.sciencemag.org/cgi/content/full/306/5696/653
> 
> Wow.
> 
> Look at its tail... it has an unfused pygostyle...
> http://www.sciencemag.org/content/vol306/issue5696/images/large/306_653_F1
> .jpeg
> :-o
> 
> Unfortunately even the resolution of this big picture is too low to either
> do reliable tracings or to have a closer look at what the pygostyle
> vertebrae really look like. They seem to have chevrons...
> 
> >     Precocial because it has a full down covering.
> 
> Mmmm... no, because it has the sheaths (consistently spelled "sheets") of
> wing & tail feathers, which means that very soon after hatching those
> feathers would have been functional.
> 
> > It's an enantiornithine.
> 
> With not much more than 50 % probability, and perhaps (for example, if
> Mickey's preliminary results are anywhere near right and Enantiornithes as
> currently understood is heavily paraphyletic) much less. Very few
> characters
> are mentioned in the text, and at least some of those are plesiomorphies.