Saccosporidae are parasites of fish and freshwater bryozoans.

Tetracapsuloides bryosalmonae, the only representative of the group whose life cycle is well studied, causes proliferative disease of the kidneys in salmonids.

Two stages of the life cycles of the two species in the genus Buddenbrockia are known.

During the second stage the animals are mobile and superficially resemble minute worms.

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