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Re: Limusaurus Inextricabilis



On Thu, Jun 18, 2009 at 3:10 AM, Mike Taylor <mike@indexdata.com> wrote:
>
> El PaleoFreak writes:
> Â> http://www.nature.com/nature/journal/v459/n7249/full/nature08124.html
> Â>
> Â> Is this a confirmation of the Wagner and Gauthier frame-shift
> Â> hypothesis on theropod digits?
>
> No -- it's an alternative to it. ÂThe tentative implication of the
> Limusaurus paper is that the three digits of derived theropods were
> always 2-3-4 after all, and not 1-2-3 as previously thought. ÂNo
> frame-shift required.

They are still positing a frame shift, though. From the abstract: "The
transition to tetanurans involved complex changes in the hand
including a shift in digit identities, with ceratosaurs displaying an
intermediate condition."

I believe there's genetic evidence which supports a frame shift as well.
--
T. Michael Keesey
Technical Consultant and Developer, Internet Technologies
Glendale, California