Re: [asa] Early evolution of light sensing

From: D. F. Siemens, Jr. <dfsiemensjr@juno.com>
Date: Tue Oct 23 2007 - 17:59:42 EDT

I like your point. I recall the "eye spot" of Euglena. Apparently there
are other protists as well who react to light.
Dave (ASA)

On Tue, 23 Oct 2007 14:00:19 -0500 "David Campbell"
<pleuronaia@gmail.com> writes:
> The summary is probably a bit miselading at points. As best I can
> tell, the novelty is the biochemical study on the genes. Many
> other
> cnidarians have quite obvious eyes; they are extremely
> well-developed
> in the box jellies (the ones that can kill you if you're careless
> about swimming around northern Australia). Demonstration of
> homology
> between the cnidarian and other animal genes would point to an
> origin
> at least by early in the latest Precambrian, though I'd like to see
> some data comparing their light-sensing genes with that of protists
> as
> evidence that sponges are primitively rather than secondarily
> lacking.
>
> --
> Dr. David Campbell
> 425 Scientific Collections
> University of Alabama
> "I think of my happy condition, surrounded by acres of clams"
>
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Received on Tue Oct 23 18:41:02 2007

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