[Aroid-l] How old are the aroids?

From: botanist at malesiana.com (Peter Boyce) on 2008.08.06 at 05:51:05(18334) Not alone, but with the addition of external data from modern distributions, molecular work and subsequent mapping, plus time line molecular work we can begin to get a handle on the family origin. The one thing that is irrefutable is that the aroids are at least early Cretaceous. I was hoping that this thread would ellicit more responses on aroid-l than it has! Peter +More ----- Original Message ----- From: Christopher Rogers To: 'Discussion of aroids' Sent: Tuesday, August 05, 2008 11:53 PM Subject: Re: [Aroid-l] How old are the aroids? Thanks, Peter! Is that sufficient to establish a molecular ?clock?? 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 ?Invertebrate Taxonomy ?Endangered Species ?Ecological Studies ?Bioassessment ?Invasive Species ?Plankton ?Phycology Moscow, Idaho ? Bozeman, Montana ? Davis, California ? Joplin, Missouri Selinsgrove, Pennsylvania ecoanalysts.com From: aroid-l-bounces at gizmoworks.com [mailto:aroid-l-bounces at gizmoworks.com] On Behalf Of Peter Boyce Sent: Wednesday, July 30, 2008 11:55 PM To: Discussion of aroids Subject: Re: [Aroid-l] How old are the aroids? Hi Christopher, The 'best fit' for this is the Lasoideae with Anaphllopsis on the Guiana Shield, Lasimorpha in West Africa Anaphyllum in S. India very best Peter ----- Original Message ----- From: Christopher Rogers To: 'Discussion of aroids' Sent: Thursday, July 31, 2008 1:37 AM Subject: [Aroid-l] How old are the aroids? 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 ?Invertebrate Taxonomy ?Endangered Species ?Ecological Studies ?Bioassessment ?Invasive Species ?Plankton ?Phycology Moscow, Idaho ? Bozeman, Montana ? Davis, California ? Joplin, Missouri Selinsgrove, Pennsylvania ecoanalysts.com ---------------------------------------------------------------------------- _______________________________________________ Aroid-L mailing list Aroid-L at www.gizmoworks.com http://www.gizmoworks.com/mailman/listinfo/aroid-l ------------------------------------------------------------------------------ _______________________________________________ Aroid-L mailing list Aroid-L at www.gizmoworks.com http://www.gizmoworks.com/mailman/listinfo/aroid-l -------------- next part -------------- An HTML attachment was scrubbed... URL: http://www.gizmoworks.com/mailman/private/aroid-l/attachments/20080806/9248e5fb/attachment-0001.htm

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