Re: Origin of body plans (phyla)

Arthur V. Chadwick (chadwicka@swau.edu)
Tue, 20 Oct 1998 17:01:37 -0700

At 05:37 PM 10/20/98 -0400, you wrote:
>>Trilobites are the first found metazoan forms in most places around the
>>world. The exceptions are exceptions and are clearly not lobopods.
>
>Trilobites are not the oldest metazoans in most places around the world.

Trilobites are the first found metazoans of certain affinities in most
places around the earth. There are a hundred sites where trilobites are
found first for every site where another metazoan of certain affinity is
found. There are no sites of which I am aware where the presumed ancestors
of the arthropods are found stratigraphically below trilobites. You can
fill me in if I am wrong.

Art
http://biology.swau.edu