From: lbmkjm at yahoo.com (brian lee) on 2008.07.31 at 17:22:42(18307)
Dear Christopher and all,
Aloha.
Wow. There must have been some sort of refugia all that time to preserve your geomorphic features for the habitat of your shrimp. I would assume that is rare. What is the geologic history of the sedimentation or other processes of the region? Are we talking about Anostracan crustacea? I know you wrote a paper on fairy shrimp in Minas Gerais...could you resend me the pdf off forum?...I seem to have lost that to virtual world. Anostracans have a geologic history from the Lower Devonian, according to my Treatise on Invertebrate Paleontology. I do not recall the age of your geomorphic features...could you refresh my poor memory? I am most familiar with the Santana formation fossils of the Late Cretaceous of Brazil...when shallow seas or lacustrine environments existed....and the connection to African fossils of similar age are proven. I am assuming your geomorphic features predate that....perhaps by a significant period.
This is a very interesting point you bring up regarding tectonic movements and botanical evolutionary trends. Are there many references on the biogeography of the aroids?
Aloha,
Leland
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--- On Wed, 7/30/08, Christopher Rogers wrote:
> From: Christopher Rogers
> Subject: [Aroid-l] How old are the aroids?
> To: "'Discussion of aroids'"
> Date: Wednesday, July 30, 2008, 7:37 AM
> Hello Peter and Sin Yeng,
>
>
>
> I understand your difficulties! I wrote a paper a few years
> ago revising a
> genus of freshwater shrimp. There are three species in the
> genus, all found
> in rain pools on a very specific geomorphic surface: one
> species in North
> America, one in South America, and one in Europe and north
> Africa. The
> geomorphic settings are all very old, and at one time
> before continental
> drift, were all near each other at the equator. Using this
> I could estimate
> the age of the genus. So here is my question: are any
> ?primitive? aroid taxa
> limited to certain geomorphic features that can be traced
> through history?
> It may give you a means of estimating evolution rates for
> some higher taxa
> levels.
>
>
>
> Grins,
>
> Christopher
>
>
>
>
>
> D. Christopher Rogers
>
> Senior Invertebrate Ecologist/ Taxonomist
>
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