Re: Wanted: 'Obscure' 1889 Paper on Trilobite Eyes & The Fibonacci Series


Perplexed in Peoria wrote:
> "John Latter" <jorolat@xxxxxxxxx> wrote in message news:drds5l$27lr$1@xxxxxxxxxxxxxxxxxxxxxx
> > Can anyone help me find the 'obscure' paper by JM Clarke that Niles
> > Eldredge refers to on page 64 of "Time Frames"? A scan of the page is
> > available here:
> >
> > http://members.aol.com/jorolat/trilobite.html
> >
> > In fact I would be grateful for any information regarding the
> > appearance of the fibonacci series in the lens arrangement of
> > trilobite eyes!
>
> I can't help you with your paper search, but the idea of a compound
> eye laid out in a phylotaxic spiral like sunflower seeds seems like
> really neat idea. I wonder why nature has apparently never come
> up with it. (Unless, as Clarke thought, nature DID use it for a
> while on trilobites.)
>
> Presumably, a beastie with two eyes would have the spirals rotating
> in opposite directions. Cool. Would the optic fiber need to twist
> as the organism gets older and adds more lenses? Or does the brain
> need to twist? Hmmm. Maybe not such a good idea after all!


Assuming the trilobite "brain" had retinotopic mapping similar to that
of modern animals, then if more facets were added to the periphery
of the eye during growth, these would map to the peripheries of the
visual regions in the brain, as the periphery of the visual regions
also
grew in proportion. Shouldn't be too difficult a trick to accomplish.
IOW, add a ring of facets around the eye, and add a corresponding
ring of neural tissue around the margin of the visual area in the
brain.


.

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