In the further course of evolution the eye opening reduced in size and as a result the eye achieved abilities comparable to a so called pinhole camera a focused but low light picture can be projected to the retina among the molluscs pinhole eyes can be found among ormers haliotidae and primitive cephalopods such as nautilus nautilus is . Scallop pallial eyes have been the most studied optical system in bivalve mollusks despite recent advances in our understanding of the function and evolution of scallop eyes little attention has been focused on eye development and early visual performance here the anatomy and development of pallial eyes were investigated in the scallop nodipecten nodosus linnaeus 1758 by means of . Two types of multi cellular eyes have been identified in the bivalvia paired cephalic eyes occurring internally above the anterior end of the ctenidia are seen only in representatives of the . For over 100 years molluscan eyes have been used as an example of convergent evolution and more recently as a textbook example of stepwise evolution of a complex lens eye via natural selection yet little is known about the underlying mechanisms that create the eye and generate different morphologies assessing molluscan eye diversity and understanding how this diversity came about will be
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