These then leave the snail, and encyst of water vegetation such as the water caltrop, infection being by ingestion of these metacercaria.
encyst on vegetation, infection of the definitive host is by ingestion of contaminated vegetation.
Conjugation of adults has been observed in several species, the most complete account being that of Zederbauer on Ceratium hirundinella (marine): either mate puts forth a tube which meets and opens into that of the other (as in some species of Chlamydomonas and Desmids); the two cell-bodies fuse in this tube, and encyst to form a resting zygospore.
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