----- 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
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