http://en.wikipedia.org/wiki/Eye
They are also possessed by Limulus, the horseshoe crab, and there are suggestions that other chelicerates developed their simple eyes by reduction from a compound starting point.(Some caterpillars appear to have evolved compound eyes from simple eyes in the opposite fashion.)
They are also possessed by Limulus, the horseshoe crab, and there are suggestions that other chelicerates developed their simple eyes by reduction from a compound starting point.(Some caterpillars appear to have evolved compound eyes from simple eyes in the opposite fashion.)
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