Recent Examples of trematode from the Web
The free-swimming trematode parasites that trigger swimmer's itch typically experience a three-host life cycle — starting with a mud snail, then a crab or a fish that will eventually be eaten by a bird.
Periwinkle snails infected with the trematode species Cryptocotyle lingua, for instance, eat significantly less algae along their Atlantic coast homes, because the parasite weakens their digestive tracts.
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