Posted: Jul 07, 2015 1:46 pm
Oldskeptic wrote:DavidMcC wrote:Oldskeptic wrote:...
The betagamma-crystallin gene found in sea squirts; the family of which is responsible for transparent lenses in vertebebrates. The similarities between the sea squirt ocellus and the vertebrate retina. Ciliary photoreceptors in sea squirts and vertebrate eyes.If you do, you need to study eye biology to a better level than "some sea-squirt eyes have a lens, so do vertebrate eyes, therefore we have the eyes of a seasquirt".
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Oldskeptic, my post, above, was not intended as a reply to the post that appears above it. Rather, one that said that because both seasquirt and veretebrate eyes eyes have lenses yet hagfish eyes do not, it is improbable that both seasquirts and hagfish are ancestral to vertebrates. I pointed out that lensed eyes are NOT universal throughout the seasquirts in any case, so the logic is not reliable. Also, I do not remember that being a reply to you.
Ideally, I should keep my own record of threads, but that needs too much computer memory and effort on my part.
Well, getting confused about what you've said is to be expected when telling lies.
I was not lying. Simple as that.
BTW, your piece on the "crystalline" eyes in seasquirts is all very interesting but has one slight flaw:
cephalopod eyes are also crystalline:
http://www.ncbi.nlm.nih.gov/pubmed/9929473
Abstract
The soluble S-crystallin constitutes the major lens protein in cephalopods. ...
It is clearly very ancient and widespread in the animal kingdom, so proves nothing concerning evoplutionary relationships within the animals.