Fine Structure of the Eyespot in the Miracidium of Philophthalmus megalurus (Cort, 1914)

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Abstract
Miracidia from worms reared in the eyes of chicks were prepared as sections for light and electron microscopy. The eyespot consists of two closely apposed pigment-cup cells, each occupied by two sensory cells with one anterior and the other posterior to a vertical septum formed by the cup cell. This orientation extends also to the rhabdomeres of the two sensory cells in each cup and facilitates interpretation of the phototactic behavior of the miracidium.

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