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Re: Declining pterosaur diversity

Jaime A. Headden wrote-

>   Okay, first, there don't appear to be that many fossil representatives
> of any mammal crown groups, and only some questionable avian crown groups
> have been identified, including an undescribed "loon," etc. A crown clade
> does not include its fossil ancestors.

There are numerous Mesozoic members of the mammalian crown group Theria.
There are a couple ameridelphian records listed here
http://home.arcor.de/ktdykes/ameridelphia.htm .  Then there are all the
'zhelestids', 'cimolestids' and 'palaeoryctids' to consider, which are
probably members of several placental crown groups (crown Laurasiatheria,
As for birds, Polarornis is described now.  And you'd have to deal with all
the neornithine-like specimens noted by Hope (2002) and others.  Anatalavis
is a crown galloanserine, for instance.

Mickey Mortimer
Undergraduate, Earth and Space Sciences
University of Washington
The Theropod Database - http://students.washington.edu/eoraptor/Home.html