[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]

Re: Archaeopteryx, Sinornithosaurus, Rahonavis, Unenlagia...]

Bill Adlam wrote:

> Josh Smith wrote:
>
> > ...If we have critters
> > with edentulous beaks, true pygostyles and such coeval with
> > _Archaeopteryx_, this is a big problem.
>
> No problem at all.  Modern birds coexist with lizards, bats with
> various gliding mammals.
>
>

    Well, actually, it IS a big problem in this case because we have
been supposing that _Archaeopteryx_ is the ancestral taxon to this
animals with the pygostyles.  If they are coeval, then it becomes
difficult for _Archaeopteryx_ to be the ancestral taxon.


--
Josh Smith
Department of Earth and Environmental Science
University of Pennsylvania
471 Hayden Hall
240 South 33rd Street
Philadelphia, PA  19104-6316
(215) 898-5630 (Office)
(215) 898-0964 (FAX)