World Congress of Malacology Antwerp ... - Unitas Malacologica

photoreceptor cell, where cilia and microvilli are present together. A rhodopsin-retinochrome system
was demonstrated in the eye of Onchidium. Retinal neurosecretory (in A. rufus) and glial cells (in L.
stagnalis) are developed. The presence of efferent innervation in the eyes and visuo-vestibular
conditioning are shown in L. stagnalis. To fully understand the morphology and functional integrity
of the gastropod eye, results on reparative eye-morphogenesis in the land snail Achatina fulica, which
has an additional eye like that of D. agreste, are discussed. Attention focuses on visual ecological
adaptations, specific visual needs and the evolutionary history of the molluscs.
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