Re: The Oldest Worms?

Glenn R. Morton (grmorton@waymark.net)
Fri, 02 Oct 1998 11:40:05 -0500

At 10:04 PM 10/1/98 -0700, Arthur V. Chadwick wrote:
>At 09:55 PM 10/1/98 -0500, Glenn wrote:
>
>>I can think of one possibility[for teh sudden appearance]. If animals
>lived off of microbes in the
>>precambrian, and then began eating each other in the cambrian, it would
>>give rise to a selective pressure for protection i.e. shells. That would
>>make the animals of the Cambrian much more preservable.
>
>Good try, tho not original, after all, what else can you say?

I know it ain't original :-) But what is the evidence against that view? I
know that the evidence for it is weak, but is there any that falsifies that
idea?

but a bit of
>a stretch to understand why all of these phyla should do so simultaneously,
>and with completely different, mature mechanisms, that still function the
>same way today (ie. not experimental). This is all assuming they even had
>the capacity to develop hard parts (which clearly they did, since they all
>developed them, didn't they???).

Not all developed the hard parts. Some soft-bodied forms are found only in
the Burgess and no where else. This implies that there were soft bodied
forms which we have no record of in more normal type deposits.

glenn

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