Re: How old are the aroids?

---

Aloha, Leland!

 

I will send you that, the biogeographical papers and some of my other papers off line. You are welcome to any of my publications, of course!

 

Yes, they are my beloved anostracans, notostracans and clam shrimps as well. I also have the book you mentioned with the chapters by Paul Tasch. So far most of the anostracan fossils have turned out to be other things like mayfly nymphs with all their abdominal gills. Some Russians have published a few papers claiming that they have anostracan fossils back to the cretaceous, however, my understanding is that the papers have not been peer reviewed, were published in less than 50 copies, and are not available outside their institutes. I have been trying for many years to acquire the texts, with no success. The only reliable fossil anostracan I am aware of is from the Miocene.

 

The animals that I mentioned in my last missive are the genus Phallocryptus, which are found in salars. The south American beast is in the salars near Buenos Aires.

 

I know this is waaaaaaaaaaaaaay off Aroids. So if anyone else is interested in my crustaceans, we can continue this topic off line.

 

Grins,

Christopher

 

 

D. Christopher Rogers

Senior Invertebrate Ecologist/ Taxonomist

((,///////////=======<

 

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-----Original Message-----
From: aroid-l-bounces@gizmoworks.com [mailto:aroid-l-bounces@gizmoworks.com] On Behalf Of brian lee
Sent: Thursday, July 31, 2008 10:23 AM
To: Discussion of aroids
Subject: Re: [Aroid-l] How old are the aroids?

 

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

 

 

--- On Wed, 7/30/08, Christopher Rogers <crogers@ecoanalysts.com> wrote:

 

> From: Christopher Rogers <crogers@ecoanalysts.com>

> Subject: [Aroid-l]  How old are the aroids?

> To: "'Discussion of aroids'" <aroid-l@gizmoworks.com>

> 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

>

> ((,///////////=======<

>

> 

>

> EcoAnalysts, Inc.

>

> 1.530.756.4481

>

> 1.530. 383.4798 (cell)

>

> 1307 "L" Street

>

> Davis, CA 95616

>

> USA

>

> 

>

> ŸInvertebrate Taxonomy

>

> ŸEndangered Species

>

> ŸEcological Studies

>

> ŸBioassessment

>

> ŸInvasive Species

>

> ŸPlankton

>

> ŸPhycology

>

> 

>

> Moscow, Idaho Ÿ Bozeman, Montana Ÿ Davis, California Ÿ

> Joplin, Missouri

>

> Selinsgrove, Pennsylvania

>

> ecoanalysts.com_______________________________________________

> Aroid-L mailing list

> Aroid-L@www.gizmoworks.com

> http://www.gizmoworks.com/mailman/listinfo/aroid-l

 

 

     

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