Studies on the invasion of Notocotylus attenuatus (Notocotylidae: Digenea) into its snail host Lymnaea peregra: the contents of the fully embryonated egg

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Abstract
The fully embryonated egg of Notocotylus attenuatus is shown to contain a sporocyst, an opercular cord and apparently 2 cells which are situated outside the sporocyst. One of these cells is rich in glycogen whereas the other contains a variety of inclusions. These contents are indicative of a truncated life-cycle which omits the miracidium, an observation as yet unique among the Digenea.