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Re: Mesozoic Neornithes



The current theories point to a Southern group including penguins,
albatrosses, loons and frigatebirds.

Joao S Lopes
Rio de Janeiro
----- Original Message -----
From: David Marjanovic <david.marjanovic@gmx.at>
To: The Dinosaur Mailing List <dinosaur@usc.edu>
Sent: Thursday, June 28, 2001 4:22 PM
Subject: Re: Mesozoic Neornithes


> > >>
> > North America, Mongolia (don't bet too much on that), Uzbekistan
> > (questionable), Chile (a bit less questionable), _Antarctica_.<<
> > (emphasis my own)
> > That's Chatterjee's loon, right?  Has that been validated?
>
> Right, *Polarornis* (forgot the specific name, if it already has one). I
> haven't seen anyone except Chatterjee ever mention it, IIRC; however, the
> skull is beautifully preserved and toothless, and the cnemial crest shows
it
> is neither a hesperornithiform nor a grebe, but a loon.
>         Finding a loon in the Southern Hemisphere (all other known ones
> except the comparatively doubtful *Neogaeornis* are from the north) isn't
as
> odd as it may seem, if the phylogenetic hypotheses that put them close to
> penguins are right. Finding one in the Cretaceous, however, is odd.
>         Chatterjee speculates that in the LK northern seas were home to
> hesperornithiforms and southern ones to loons.
>