Abstract
Ultrastructural observations of Haplometra cylindracea sporocysts revealed that the so-called “paletot”, a peculiar structure covoring the daughter sporocysts of various Plagiorchiid trematodes, derives from modified snail host hemocytes. This study emphasizes an unusual interference of the parasite with the snail's internal defense system; free hemocytes, whether attracted or trapped, are modified by their contact with the parasite, which seems to use them as a covering and as a source of nutrients.
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