[Taxacom] Evolution of molluscs and other invertebrates

[Jim Croft]

given the unholy orgiastic miscegenous soup of eggs and sperm in the
ocean, it's a miracle that genetics and evolution work at all.  :)

jim

On Sat, Jul 11, 2009 at 9:08 AM, Dr. David Campbell<amblema at bama.ua.edu> wrote:
> Quoting Bob Mesibov <mesibov at southcom.com.au>:
>
>> Richard Petit wrote:
>>
>> "Don't forget that Mollusca has bivalved gastropods."
>>
>> Candidate  case for horizontal gene transfer of developmental genes?
>
> No.  The details of bivalved form are rather different.  In particular,
> the snails start out with a fairly normal single shell before starting
> to grow the second valve.  I think a recent paper actually looked at
> some key developmental genes and found the pattern to be different.
> Bivalved body plans turn up here and there in several taxa (various
> Crustacea, Brachiopoda, diatoms, etc.)
>
> There are also good transitional forms in the early Cambrian mollusks
> going from single shelled to bivalves.
>
> --
> Dr. David Campbell
> 425 Scientific Collections Building
> Department of Biological Sciences
> Biodiversity and Systematics
> University of Alabama, Box 870345
> Tuscaloosa AL 35487-0345  USA
>
>
> _______________________________________________
>
> Taxacom Mailing List
> Taxacom at mailman.nhm.ku.edu
> http://mailman.nhm.ku.edu/mailman/listinfo/taxacom
>
> The Taxacom archive going back to 1992 may be searched with either of these methods:
>
> (1) http://taxacom.markmail.org
>
> Or (2) a Google search specified as:  site:mailman.nhm.ku.edu/pipermail/taxacom  your search terms here
>



-- 
_________________
Jim Croft ~ jim.croft at gmail.com ~ +61-2-62509499 ~
http://www.google.com/profiles/jim.croft

... in pursuit of the meaning of leaf ...